Acute Lung Injury (ALI) and Medical Cannabis
Short answer
Acute lung injury (ALI) is a sudden inflammation of both lungs that lets fluid leak into the air sacs and drives blood oxygen down; it is treated in the hospital, often in intensive care, and is now classed as a form of ARDS. No clinical trial has tested cannabis or any cannabinoid for acute lung injury in people. Smoke and hot vapor travel through the injured airways; forms that are not inhaled bypass them, but THC effects, liver processing, drowsiness and drug interactions come with every form.
Everything known about cannabinoids and ALI comes from experiments in mice, rats and cells, and those results cannot be applied to people. Each of the 13 studies cited here is labeled by who or what was studied; the overview starts at what the research shows.
When breathing trouble is an emergency: call 911 first
Acute lung injury can worsen within hours. If any sign below appears, in you or in someone near you, call for emergency care now. Questions about cannabis belong to a calmer day.
- Shortness of breath that comes on fast or is severe even at rest.
- Lips, fingertips or nail beds that look blue or gray.
- New confusion, unusual sleepiness or trouble staying awake.
- Very fast breathing together with a racing heart.
- Trouble breathing during or within hours of a blood transfusion.
- Cough, chest pain or breathlessness after vaping, especially an unlabeled THC cartridge.
- Breathing that gets worse again after you came home from the hospital.
What to tell the emergency team
- Everything taken in the last few days: prescriptions, oxygen at home, cannabis, CBD and any vape product.
- When the breathing trouble started, and any recent infection, surgery, fall or transfusion.
- Bring the vape cartridge or a photo of its label if one was used. Knowing what was in it saves time.
How this page was put together
- Each research figure is tied to a paper you can open in the reference list at the bottom.
- Every study says plainly whether it used mice, rats or cells in a dish. None used patients with ALI.
- Research molecules made in a lab are kept apart from the THC and CBD products sold in state programs.
- Reviewed by physicians licensed in the states where we work. See our doctors.
Sudden breathlessness, days on a ventilator, months of recovery: what acute lung injury takes from patients and families
Acute lung injury rarely starts in the lungs alone. Pneumonia, a bloodstream infection, a car crash or a transfusion comes first, and within hours or a couple of days breathing turns hard. Many families hear the words ARDS and ventilator in the same conversation.
The hospital part is only half of it. People come home short of breath on the stairs, weak, sleeping badly, and some keep reliving the ICU. Those close to them carry the decisions, the waiting room and then the care at home.
Days in the ICU
Oxygen, a breathing machine, sometimes lying face down for hours. The care is about buying the lungs time while the cause is treated.
Breathless after discharge
Recovery is measured in weeks and months. Weak muscles, pain, poor sleep and anxiety often outlast the lung changes themselves.
When it is someone you love
Partners and adult children often make the calls, learn the machines and notice the first sign that something is off at home.
Somewhere in those months a question about cannabis may come up, for pain, sleep or worry. This page lays out what is known, what has only been seen in mice, and what is risky for injured lungs, so you can bring a clear question to a doctor.
In the hospital, recovering after ARDS, or worried about vaping: where to start
Choose what describes you right now. Only the matching card stays open, with the sections worth reading first.
You are in the hospital now
Cannabis is not part of this stage. Tell the team about every substance used in recent days, cannabis, CBD and vapes included, and ask what they think caused the injury.
You are home and recovering after ARDS
Breathlessness, weakness, pain, poor sleep or anxiety after intensive care are common. Once you are off acute care, those symptoms are a fair topic for a physician who sees your full medicine list.
You have a cough or breathlessness after vaping
Vaping-associated lung injury (EVALI) was tied to vitamin E acetate in THC cartridges from informal sources. Severe symptoms need emergency care; keep the cartridge for the doctors.
Someone close to you is in the ICU or just came home
Ask the team what caused the injury and what to watch for after discharge. At home, a new rise in breathlessness, confusion or blue lips means calling for help again.
You already use cannabis
With injured or healing lungs, the form matters: smoke and vapor reach the airways, and every form can interact with medicines started in the hospital.
You already have a medical card
A lung injury and an ICU stay are new medical history. Mention them, and any new medicine, at your next evaluation so the physician can review your plan.
What is acute lung injury (ALI)? Definition, Berlin criteria and ICD-10 codes
Acute lung injury is a sudden, widespread inflammation of both lungs. The thin wall between the air sacs (alveoli) and the tiny blood vessels around them starts to leak, fluid floods the air sacs, and oxygen can no longer pass into the blood. The fluid does not come from heart failure, which is why doctors call it non-cardiogenic pulmonary edema.
Under the microscope the damage is called diffuse alveolar damage: swollen, broken air-sac linings coated with protein. The name ALI comes from the 1994 American-European Consensus Conference (AECC) [1]. Since the Berlin definition of 2012, what used to be called ALI is counted as mild ARDS, acute respiratory distress syndrome [2]. The older name still lives on in laboratory research, where scientists write about “ALI models” in mice. A bruised or punctured lung after an injury (lung contusion, pneumothorax) is a different problem, though a contusion can lead to ALI.
Acute lung injury
How fast
Hours to days, usually after a clear trigger such as pneumonia or sepsis.
Can it reverse?
Often, fully or largely, once the cause is under control.
Where it is treated
In the hospital, often in intensive care.
What can stay afterward
How fast
Noticed over the months after discharge.
What it looks like
Breathlessness on effort, a lower lung test result, and in some people scarring (pulmonary fibrosis).
How it is followed
Lung function tests and visits with a lung specialist [3].
ICD-10-CM codes for acute lung injury
ICD-10-CM has no separate code named “acute lung injury”. Records of ALI and ARDS usually carry J80, and a second code names the cause or the breathing failure. The codes below follow the ICD-10-CM code set; your record may use a more specific one [4].
Filter the codes by the part of the discharge papers you are reading.
| Code | What it means |
|---|---|
| J80 | Acute respiratory distress syndrome: the usual code for ALI and ARDS |
| J96.0- | Acute respiratory failure (J96.01 with low oxygen, J96.02 with high carbon dioxide) |
| J95.84 | Transfusion-related acute lung injury (TRALI) |
| U07.0 | Vaping-related disorder, used for EVALI |
| J68.- | Respiratory conditions caused by chemicals, gases, fumes and vapors |
| S27.3- | Other injuries of the lung from trauma, such as a contusion |
| F12.- | Cannabis-related disorders, coded separately from any lung diagnosis |
No codes match this filter.
These codes sit on the discharge summary that many patients bring to a medical card evaluation, so it helps to know what each one says.
Acute lung injury vs ARDS: is it the same thing?
Mostly, yes. Acute lung injury and ARDS describe the same process at different severity, and since the 2012 Berlin definition the old ALI range is simply called mild ARDS [2]. What changed over three decades is how doctors draw the line.
American-European Consensus Conference 1994
Created two names. Acute lung injury meant sudden onset, shadows in both lungs on a frontal chest X-ray, no sign that a failing left heart explained them, and a PaO2/FiO2 ratio of 300 mm Hg or less. ARDS was the more severe end, with a ratio of 200 or less [1].
Berlin definition 2012
Dropped the term ALI. ARDS became one syndrome in three grades: mild (ratio 201 to 300), moderate (101 to 200) and severe (100 or less), each measured with at least 5 cm H2O of PEEP. It added a time limit of one week from the trigger or new symptoms, and allowed CT as well as X-ray [2].
Global definition 2023, published 2024
Widened Berlin so ARDS can be recognized outside fully equipped ICUs: patients on high-flow nasal oxygen of at least 30 L per minute count, a pulse-oximeter ratio (SpO2/FiO2 of 315 or less) can stand in for a blood gas, and lung ultrasound can replace X-ray or CT where needed [5].
| Feature | AECC 1994 | Berlin 2012 | Global 2023 |
|---|---|---|---|
| Name of the mild range | Acute lung injury | Mild ARDS | Mild ARDS |
| Timing | Acute onset, not defined in days | Within 1 week | Within 1 week |
| Oxygen measure | PaO2/FiO2 300 or less (ARDS 200 or less) | PaO2/FiO2 in three grades, with PEEP 5 or more | Same grades, or SpO2/FiO2 315 or less |
| Imaging | Chest X-ray | Chest X-ray or CT | X-ray, CT or lung ultrasound |
| Heart excluded by | Wedge pressure 18 mm Hg or less, or clinical judgment | Clinical judgment, echo if unclear | Clinical judgment, echo if unclear |
Why older papers say “ALI/ARDS”
Studies written before 2012 had two categories to report, so they often grouped them as ALI/ARDS. Reading an older paper, treat ALI as the milder group. Today the term mainly survives in two places: laboratory work, where an injury caused in mice with bacterial toxin (LPS) is called an “LPS-induced ALI model”, and transfusion medicine, where TRALI kept its name.
Acute lung injury symptoms and warning signs
Symptoms of acute lung injury usually build over hours to a few days after the trigger, and the lead symptom is breathlessness that keeps getting worse. Under the Berlin rules, the lung problem has to appear within one week of the trigger or of new breathing symptoms [2]. Signs of the illness that started it, such as fever with pneumonia or sepsis, often show up at the same time.
Early signs
- Shortness of breath that grows over hours.
- Fast, shallow breathing.
- A dry cough or a feeling of tight chest.
- A fast heartbeat and restlessness.
Severe signs: call 911
- Low oxygen on a pulse oximeter despite resting.
- Blue or gray lips and fingertips.
- Confusion or extreme drowsiness.
- Exhaustion from the work of breathing.
Is it lung injury or a flare of something you already have?
An asthma or COPD flare
Flares usually come with wheezing and respond to the inhalers you already use. Acute lung injury fills the air sacs with fluid, so the usual inhaler barely helps and oxygen keeps dropping. Anyone with chronic lung disease and a new, fast decline needs to be seen the same day. More on COPD and medical cannabis.
Fluid from the heart
A weak heart can also back fluid into the lungs, with swollen ankles and breathlessness lying flat. Doctors rule this out with an ultrasound of the heart and a blood test called BNP, because the treatment is different.
Pneumonia on its own
Pneumonia is an infection in one part of the lung. It is the most frequent cause of ALI, but not the same thing: ALI is diagnosed when the inflammation spreads to both lungs and oxygen falls below the thresholds above.
What causes acute lung injury? Sepsis, pneumonia, aspiration, trauma and more
Doctors group the causes by the route the damage takes: straight into the lung through the airways, through the bloodstream from somewhere else in the body, or from treatment itself. Pneumonia and sepsis lead both lists in most hospitals.
What happened before it started?
Choose the event closest to what happened. Its group is outlined below, with a line on how it harms the lungs.
Direct
Injury from inside the lung
Pneumonia, stomach contents breathed in (aspiration), smoke and toxic gases, vaping products, near-drowning and a bruised lung after a blow to the chest.
Indirect
Injury through the bloodstream
Sepsis, inflammation of the pancreas, major trauma and burns, and large transfusions. The lung is hurt by signals carried in the blood.
From care itself
Injury from treatment
A breathing machine set too hard (ventilator-induced lung injury), very high oxygen for a long time (hyperoxia), some medicines, and TRALI after a transfusion.
Choose an event above to see how it harms the lungs.
Pneumonia starts as an infection in part of a lung. When the immune reaction spills over, both lungs leak fluid. It is the most common direct cause.
Breathing in stomach contents, for example while unconscious or after heavy drinking, burns the airway lining with acid and can set off injury within hours.
Smoke from a fire, chlorine or other toxic gases damage the air sacs directly. Researchers model this kind of injury in mice with chemicals such as a sulfur mustard analog [6].
Vaping can injure the lungs directly. The 2019 to 2020 EVALI outbreak was linked to vitamin E acetate in THC cartridges [7]; see the vaping section.
Sepsis floods the blood with inflammatory signals that damage the lining of the lung’s capillaries. Fluid then leaks into the air sacs, even though the infection may have started in the gut or urine.
Acute pancreatitis releases enzymes and inflammatory signals into the blood, which can injure the lungs days into the illness.
A serious injury can harm the lungs twice: directly through a bruised lung, and indirectly through blood loss, shock and many transfusions.
A transfusion can cause TRALI, an immune reaction in the lungs within hours of receiving blood; see TRALI below.
A ventilator or high oxygen save lives, but too much pressure or volume stretches the air sacs, and very high oxygen for long periods is toxic to them. Mouse studies use 95% oxygen to create this injury [8].
How does sepsis cause lung injury?
Sepsis is the body’s runaway response to an infection. Bacterial pieces and the body’s own alarm signals travel in the blood, switch on white blood cells and loosen the lining of blood vessels everywhere, including the lungs. That is why someone with a kidney or gut infection can end up on a ventilator. The research on sepsis itself is covered in sepsis and medical cannabis.
Can acute lung injury be prevented?
- Treating pneumonia and other infections early, before sepsis sets in.
- Protecting the airway of anyone who is very drowsy or vomiting, to prevent aspiration.
- Using blood products only when needed, which is how hospitals lower the risk of TRALI.
- Gentle ventilator settings and no more oxygen than needed in intensive care.
- Avoiding THC vape cartridges from informal sources, the products tied to EVALI [7].
Lung injury after a transfusion · Sepsis and medical cannabis
Transfusion-related acute lung injury (TRALI): what causes it and how it is handled
Transfusion-related acute lung injury (TRALI) is new lung injury that begins during or within 6 hours of a blood transfusion, with low oxygen and shadows in both lungs, when no other cause explains it better [9]. It is rare, and it is one of the leading causes of serious transfusion reactions.
The usual cause is antibodies in the donor’s plasma, against white-cell markers called HLA or HNA, that recognize the patient’s white blood cells. Those cells gather in the lungs and damage them. Doctors describe it as a “two-hit” event: the patient’s illness primes the lungs first, and the transfused blood delivers the second hit.
What goes wrong
TRALI
Leaky lung vessels from an immune reaction.
Transfusion overload (TACO)
Too much fluid for the heart to handle.
Blood pressure
TRALI
Often falls; fever can appear.
Transfusion overload (TACO)
Often rises, with neck veins full.
Heart tests
TRALI
Heart ultrasound and BNP usually look normal.
Transfusion overload (TACO)
BNP is often high, signs of fluid strain.
Treatment
TRALI
Stop the transfusion, oxygen and breathing support; water pills do not help.
Transfusion overload (TACO)
Stop or slow the transfusion and remove fluid with water pills.
How TRALI is handled
The transfusion is stopped at once and the blood bank is told. Care is supportive: oxygen, and a ventilator if needed. Most people improve within a few days. The blood bank traces the donor so the same donor’s plasma is not given again.
How blood banks lower the risk
US blood centers favor plasma from male donors and from women tested for these antibodies, because pregnancy is the usual way donors develop them. Hospitals also transfuse only when needed. The code for TRALI on hospital records is J95.84 [4].
Vaping and lung injury · Breathing trouble after a transfusion
Can vaping cause lung injury? EVALI and vitamin E acetate
Vaping can cause acute lung injury. In 2019 and early 2020, a US outbreak of e-cigarette or vaping use-associated lung injury (EVALI) put 2,807 people in the hospital and was linked to 68 deaths by February 18, 2020 [7]. CDC investigators found that most patients had used THC-containing products, mostly from informal sources such as friends or online dealers, and named vitamin E acetate, a thickener added to some illicit cartridges, as strongly linked to the outbreak [7].
The finding fits what lung doctors saw: injury from the inhaled oil and its breakdown products, not from cannabis in tested, labeled form. That does not make any vape safe for injured lungs; heated aerosol still reaches the airways.
What was in the cartridge?
Pick the closest match to see what the doctor needs to hear.
From a state dispensary. Give the brand, the THC and CBD amounts on the label, how often you used it and when you last did. Tested products are not what the outbreak was traced to, so doctors will also look for other causes.
Unlabeled, bought from a friend, online or on the street. Say so plainly and keep the cartridge. This is the group linked to vitamin E acetate during the outbreak [7].
A nicotine vape. EVALI cases were mostly tied to THC products, but nicotine vaping also heats aerosol into the airways. Name the device and liquid.
Dabs, wax or other concentrates. Very strong and heated to high temperatures. Mention the product, the device and how much you used.
Not sure. That is useful too. Describe the package, where it came from and when you used it; the team may run extra tests.
EVALI symptoms and when to see a doctor
- Cough, chest pain and shortness of breath that build over days to weeks.
- Nausea, vomiting, belly pain or diarrhea, which often come first.
- Fever, chills and fast heartbeat.
Anyone who vapes and develops these symptoms should see a doctor and say exactly what was vaped; severe breathlessness means 911. On hospital records the vaping diagnosis is coded U07.0 [4].
When to call 911 · What each form of cannabis avoids and keeps
Does cannabis smoke or vapor damage the lungs?
The risk of smoke is the risk of smoke, not of cannabis as such. Burning any plant puts hot particles and irritants into the airways. Vaporizers heat without burning, but the aerosol is still hot and still travels the same path. For lungs that are healing from ALI, both are extra load on the very tissue that was injured.
Smoke and the airways joints, blunts, pipes, bongs
Regular smoking of cannabis is linked to cough, phlegm and bouts of bronchitis, much like tobacco smoke irritates the airways. None of the acute lung injury studies on this page tested smoked cannabis, so there is no evidence it helps an injured lung, and good reason to keep smoke away from one.
Vapor and dabs vape pens, cartridges, concentrates
Hypersensitivity pneumonitis: what it is and why it comes up
Hypersensitivity pneumonitis is an allergic-type inflammation of the air sacs caused by something breathed in again and again, such as mold or bird proteins. Moldy plant material is one possible trigger, which is why doctors ask about anything inhaled when the lungs are inflamed for no clear reason.
COPD and medical cannabis · Pulmonary fibrosis and medical cannabis
What happens inside injured lungs: inflammation, macrophages and the NLRP3 inflammasome
Inside an injured lung, the immune system overreacts. White blood cells pour into the air sacs, release chemical alarm signals and damaging oxygen molecules, and the thin barrier between air and blood breaks down. Pathologists call the result diffuse alveolar damage, and it unfolds in phases.
Exudative phase first days
Fluid and protein leak into the air sacs and form glassy layers on their walls (hyaline membranes). Oxygen falls fast. This is when patients need the most support.
Proliferative phase about the second week
Repair begins. New lining cells grow, fluid is cleared and many patients come off the ventilator. Breathing still tires them quickly.
Fibrotic phase in some patients
In a minority, repair overshoots and leaves scar tissue that stiffens the lungs. This is the root of lasting breathlessness after ARDS; see pulmonary fibrosis.
The cells and signals researchers study
Neutrophils and NETs
Neutrophils are the first white cells to arrive. They can throw out sticky webs of DNA called neutrophil extracellular traps (NETs) that catch germs but also damage lung tissue. In mice, switching on the CB2 receptor limited how many neutrophils arrived and how many NETs formed [13].
Macrophages
Macrophages are the lungs’ resident clean-up cells. In an inflamed state they pump out alarm signals; in a calmer state they help repair. Mouse work found CB2 activation pushed lung macrophages away from the inflamed state [6].
NF-kB, the master switch
The NLRP3 inflammasome
An inflammasome is a protein machine inside immune cells that, once assembled, releases the strong alarm signal IL-1 beta. NLRP3 is the best-known one. A CBD-derived lab compound that blocks the TRPV4 calcium channel reduced this pathway in mice [12].
Ferroptosis and GPX4
Ferroptosis is a form of cell death driven by iron and damaged fats in cell walls. GPX4 is the enzyme that protects against it. In mice breathing 95% oxygen, a CB2-activating compound raised GPX4 and reduced this kind of cell death [8].
How researchers create ALI in mice
How is acute lung injury diagnosed? Blood gases, chest X-ray and CT
Acute lung injury is diagnosed from three things together: how much oxygen reaches the blood, what the chest images show, and proof that the heart is not the cause. The diagnosis is made in the hospital, usually within hours of arrival.
Arterial blood gas and the P/F ratio main test
A blood sample from an artery shows PaO2, the oxygen pressure in the blood. Divided by the fraction of oxygen being breathed (FiO2), it gives the P/F ratio. A healthy person breathing room air sits well above 400; 300 or less marks the ARDS range [2].
Chest X-ray first image
Shows white patches in both lungs that are not explained by fluid around the lungs, a collapsed lobe or nodules [2]. Radiologists often write “bilateral opacities”.
CT scan detail
Shows more detail than an X-ray and helps find a hidden cause such as an abscess. The injury is usually patchy and worst in the parts of the lungs closest to the bed.
Heart ultrasound and BNP rules out the heart
An echocardiogram and the BNP blood test check whether a weak heart could explain the fluid. If it can, the problem is cardiogenic edema, treated differently.
Bronchoscopy finds the cause
A thin camera passed into the airways can wash out a sample (lavage) to look for infection, blood or unusual cells, for example in EVALI or when the cause is unclear.
Lung biopsy rarely needed
Reserved for cases where treatment would change and no other test explains the illness. Under the microscope it shows diffuse alveolar damage or another disease that mimics it.
Acute lung injury score: reading the Murray score in ICU notes
The acute lung injury score most often meant is the Murray Lung Injury Score, published in 1988 [16]. Doctors give 0 to 4 points for each of four findings and divide the total by the number of findings they scored. A result of 0 means no lung injury, 0.1 to 2.5 mild to moderate injury, and above 2.5 severe injury [16]. ICU teams still use it in research and to decide on advanced support such as ECMO. Families meet it in notes and letters, and that is what the tool below is for: reading a number, not making a diagnosis.
| Points | Chest X-ray | P/F ratio | PEEP (cm H2O) | Compliance (mL/cm H2O) |
|---|---|---|---|---|
| 0 | No quarter of the lungs affected | 300 or more | 5 or less | 80 or more |
| 1 | 1 quarter | 225 to 299 | 6 to 8 | 60 to 79 |
| 2 | 2 quarters | 175 to 224 | 9 to 11 | 40 to 59 |
| 3 | 3 quarters | 100 to 174 | 12 to 14 | 20 to 39 |
| 4 | All 4 quarters | Below 100 | 15 or more | 19 or less |
Chest X-ray: quarters of the lungs that look white
The radiology report in your patient portal names the affected zones. If it does not count quarters (quadrants), ask the care team.
From the arterial blood gas (ABG) result, in mm Hg. It is listed as PaO2 or pO2 in the lab section of the portal.
The oxygen setting written next to the same blood gas, in percent. Room air is 21%; a ventilator note may say “FiO2 0.5”, which means 50%.
PEEP on the ventilator
Positive end-expiratory pressure, in cm H2O, from the ventilator settings in the ICU notes. Without a ventilator this part is left out.
Lung compliance
Static compliance (Cstat), in mL per cm H2O, appears only on ventilator printouts. Most families will not have it, and the score still works with the other parts.
Choose at least one value to see a score.
–
Lung Injury Score
- No injury (0)
- Mild to moderate (0.1 to 2.5)
- Severe (above 2.5)
- P/F ratio
- –
- Points per part
- –
- Berlin oxygen range
- –
A reading aid, not a diagnosis. The Berlin ranges also require PEEP of at least 5 cm H2O, shadows in both lungs and onset within a week [2]; the care team weighs all of that.
How is acute lung injury treated? Ventilation, prone positioning and ECMO
There is no single drug that cures acute lung injury. Treatment in the hospital supports breathing and keeps the lungs from further harm while the cause, such as an infection, is treated [3].
-
Treat the cause
Antibiotics for pneumonia or sepsis, stopping a transfusion in TRALI, drainage of an abscess.
-
Gentle ventilation
Oxygen by mask or high-flow tube; if needed, a ventilator set to small breaths and low pressure to spare the lungs.
-
Lying face down
In severe cases, turning the patient onto the stomach for long stretches (prone positioning) opens more of the lungs.
-
Careful fluids, ECMO
Avoiding extra fluid once blood pressure is stable; in the sickest, a machine that oxygenates blood outside the body.
Steroids and muscle relaxants
Corticosteroids calm inflammation and are used in some causes of ARDS, such as severe COVID-19 or certain pneumonias; for others the evidence is debated and doctors decide case by case. Short courses of muscle relaxants may be used early in severe ARDS so the patient breathes in step with the ventilator. Both are hospital decisions with close monitoring [3].
Ventilator-induced lung injury (VILI)
A ventilator pushes air in under pressure. Breaths that are too large or pressures that are too high overstretch the air sacs and can add injury of their own. That is the reason ICU teams use small breaths in ARDS even when the numbers look low.
Patient self-inflicted lung injury (P-SILI)
A term from intensive care for a patient breathing so hard on their own that the strong swings in pressure stretch already injured lungs. It is one reason doctors sometimes move to a ventilator sooner rather than later.
Cannabinoids are not part of standard care for acute lung injury, and no hospital guideline includes them.
Recovery and life after ARDS · What cannabinoid research has tested
How long does a lung injury take to heal? Recovery, outcomes and life after ARDS
Healing after acute lung injury takes weeks in the hospital and then months at home. Many people regain most of their lung function within the first year, but breathlessness, weakness and fatigue can linger well beyond that, and some never get all the way back [3]. Lung inflammation itself usually settles over weeks; what lasts longer is the toll of critical illness on muscles, nerves and mind.
In the ICU
Breathing support until oxygen improves, then a slow wean from the ventilator.
On the ward
Getting out of bed, walking with help, learning which medicines continue at home.
The first weeks home
Short walks, oxygen for some, and a follow-up visit. Ask for a referral to pulmonary rehabilitation.
The months after
Lung function tests and, where available, a post-ICU follow-up clinic that looks at body, mind and memory together [3].
Can acute lung injury be cured?
In the sense that the lungs heal, often yes. The inflammation resolves and the air sacs clear in most survivors. In some, healing leaves scar tissue that keeps the lungs stiff; that path is covered in pulmonary fibrosis and medical cannabis. No medicine, cannabinoids included, has been shown to speed that healing in people.
Post-intensive care syndrome
Post-intensive care syndrome (PICS) is the name for new or worse problems after an ICU stay: weakness, pain, poor sleep, anxiety, depression, flashbacks of the ICU and trouble with memory or focus [3].
What are you living with now?
Tap everything that applies. The matching notes open below.
Breathlessness
Pulmonary rehabilitation, a supervised exercise and breathing program, is the main help. Any new rise in breathlessness needs a check, not just patience.
Weakness
Muscles waste fast in bed. Physical therapy rebuilds them over months; falls are a real risk in the first weeks.
Pain
Joint, shoulder and nerve pain are common after long ICU stays. It is one of the symptoms some patients raise with a physician when they ask about medical cannabis; see is it worth raising.
Poor sleep
ICU sleep is broken by alarms and light, and the pattern can persist at home. Mixed evidence on cannabis and sleep is summed up in is cannabis good or bad for sleep.
Anxiety, low mood and flashbacks
Many survivors and family members have symptoms of post-traumatic stress after the ICU. Talking therapy helps; tell your doctor if nightmares or panic keep returning.
Memory and focus
Low oxygen, sedation and delirium in the ICU can leave thinking slower for months. Note that THC can also affect memory and attention, which matters for anyone already struggling.
Helping someone recover from acute lung injury
Family members often notice trouble first. At home, watch for rising breathlessness, blue lips, new confusion or a fever, and call for help rather than wait for the next appointment. Keep one folder with the discharge summary, the medicine list and the follow-up dates. Your own sleep and stress count too: the people who sat in the ICU waiting room get PICS-like symptoms as well, and the follow-up clinic or your own doctor can point you to support.
Recovering from a lung injury: is cannabis a fair question for your doctor yet?
Thirteen short questions about where you are in recovery, your breathing, your medicines and the symptom that bothers you most. You get a summary of how your answers fit what is known, and what to take to a physician.
13 questions · about a minute · your answers stay in this browser
Is medical cannabis worth raising with your doctor after acute lung injury?
For the lungs themselves, no. For some of what follows a lung injury, it can be a fair question once the acute phase is over. Timing decides most of the answer, and the symptom you want help with decides the rest.
Not now
During the acute phase
In the ICU, on a ventilator, on new oxygen or still getting worse: nothing new is added without the care team, and no form of cannabis has a role here.
Later, as a question
Symptoms after discharge
Once breathing is stable, lingering pain, poor sleep, anxiety or ICU flashbacks are reasonable topics for a physician who sees your history and medicine list.
Not for the lungs
Repairing the lung itself
The only evidence of lung protection comes from mice, rats and cells, mostly with lab compounds. Nobody can promise that cannabis helps an injured lung heal.
An online evaluation looks at you, not at the diagnosis in general: the physician reviews your records, your current medicines and your state’s rules before deciding whether a recommendation fits your situation.
Why researchers look at cannabinoids in acute lung injury: CB2 and the endocannabinoid system
The body makes its own cannabis-like messengers, called endocannabinoids, and carries receptors that respond to them. Together they form the endocannabinoid system. Two receptors matter most. CB1 sits mainly on nerve cells and is the one THC acts on to cause a high. CB2 sits mainly on immune cells, including those that flood the lungs in ALI, and helps turn inflammation down.
Because runaway inflammation drives the damage in acute lung injury, researchers ask whether switching CB2 on, or protecting the body’s own cannabinoids from breakdown, can limit it. Almost all of this work is in mice and rats, with lab compounds rather than cannabis. A longer explainer is in the endocannabinoid system.
CB2: turning down the immune response in mice and rats
Lab compounds that switch on CB2 only, JWH133 and HU-308, reduced lung inflammation in mice and rats injured by bacterial toxin, high oxygen, the SARS-CoV-2 spike protein, a mustard-gas analog, live bacteria and the weed killer paraquat [8][13][6][14][17][18]. The reported routes run through lower NF-kB activity, fewer neutrophils and NETs, calmer macrophages and more of the protective enzyme GPX4.
TRPV4: a calcium gate in lung cells in mice
TRPV4 is a channel that lets calcium into lung and immune cells; too much calcium sets off inflammation and leaky vessels. CS-85, a new molecule made from a CBD-like starting compound, blocked TRPV4 and reduced fluid in the lungs and leakiness of lung vessels in mice, with less NLRP3 inflammasome activity [12].
Keeping the body’s cannabinoids around longer in mice
Enzymes called MAGL and FAAH break down the body’s own cannabinoids. Blocking MAGL with the research drug JZL184 lessened lung injury in mice through both CB1 and CB2 [19]. Carmofur, an old cancer drug, blocks FAAH and a related enzyme, NAAA, and eased toxin-induced lung injury in mice in a way that depended on CB2 [20].
CB1: the THC receptor little lung data
CB1 appears in the lung studies mainly as a partner of CB2 in the MAGL work [19]. It is also the receptor behind the high, drowsiness and fast heartbeat of THC, which is why researchers aiming at lung inflammation prefer compounds that leave CB1 alone.
What the research shows, from strongest to weakest: no studies in patients yet
In mouse and cell studies, compounds that activate the CB2 receptor reduced lung inflammation and injury. These are lab compounds, not products sold to patients, and no study has tested any cannabinoid in people with acute lung injury.
A randomized trial in patients can show whether something helps. An observational study can show a link. A case report shows what can happen to one person. An animal or cell experiment shows a possible mechanism and nothing more. For cannabinoids and ALI, the top two rungs are empty.
| Level | What exists for ALI | What it can and cannot tell you |
|---|---|---|
| Trials in patients | None. | Nothing is known about benefit in people. |
| Observational studies in patients | None. | No link, helpful or harmful, has been measured. |
| Animal studies | CB2-activating compounds, a CBD-derived molecule and enzyme blockers in mice and rats [8][12][19]. | Explains why scientists are interested. Does not show what happens in patients. |
| Cell and test-tube studies | Mouse lung cells exposed to high oxygen [8] and the chemistry of heated vitamin E acetate [10]. | A first step; a dish is not a body. |
What kinds of studies is this evidence built on?
Each row is a study design, with the most convincing designs at the top. The bar grows with the number of published studies of that design on cannabinoids and acute lung injury, and the figure on the right is the count. Gray bars are background research, meaning animal, cell and review work, which can point to ideas but cannot show that patients benefit.
Show as a table
| Design | Studies |
|---|---|
| Randomized trials in patients | 0 |
| Observational studies in patients | 0 |
| Case reports | 2 |
| Narrative reviews (background) | 1 |
| Animal studies (background) | 28 |
| Cell studies (background) | 2 |
When were the studies cited here published?
One row per year for the 13 studies this page relies on; a longer bar means more of them came out that year.
Show as a table
| Year | Studies |
|---|---|
| 2013 | 1 |
| 2014 | 2 |
| 2019 | 1 |
| 2022 | 5 |
| 2025 | 1 |
| 2026 | 3 |
Browse the studies cited here
One card per paper, in a sentence or two. Papers about harm from vaping, and papers that did not test a cannabis compound at all, keep their place with a label.
CS-85, a CBD-derived TRPV4 blocker
Given into the windpipe, it reduced fluid in the lungs and leaky lung vessels in mouse models of lung injury [12].
JWH133 and lung injury from high oxygen
The CB2 compound raised GPX4 and reduced iron-driven cell death in mice breathing 95% oxygen and in mouse lung cells [8].
HU308 and the SARS-CoV-2 spike protein
Lessened lung injury, neutrophil influx and NET formation in mice given a spike protein piece, not the live virus [13].
HU308 and a mustard-gas analog
Eased lung injury and inflammation in mice exposed to CEES, a chemical that imitates sulfur mustard [6].
HU-308 in a pneumonia-like toxin model
Reduced inflammation throughout the body in mice given bacterial toxin into the nose; the study also ran a steroid, dexamethasone, for comparison [15].
JWH133 and Pseudomonas pneumonia
Protected mice against lung injury from live bacteria; blocking CB2 removed the effect [14].
CB2 activation in septic rats
JWH133 eased lung injury over 6 hours in rats with toxin-induced sepsis [17].
Heated vitamin E acetate makes duroquinone
Vaping vitamin E acetate produced a compound that causes oxidative stress in lung cells; metal coils sped the breakdown [10].
A yam-plant compound and lung injury
A molecule from Chinese yam (A1) eased toxin-induced lung injury in mice through an estrogen receptor, not a cannabinoid receptor [21].
Carmofur blocks FAAH and NAAA
An old cancer drug eased toxin-induced lung injury in mice, and the effect depended on CB2 [20].
JWH133 and paraquat poisoning
Given before the weed killer paraquat, it reduced lung swelling and inflammation in rats [18].
Sweet clover extract in septic rats
A melilotus extract raised CB2 in rat lungs, and more CB2 went with less NF-kB; it is a plant extract, not cannabis [22].
Blocking MAGL with JZL184
Keeping the body’s own cannabinoid 2-AG around longer reduced lung injury in mice through CB1 and CB2 [19].
No studies of this type are cited here.
How big were the effects in animal studies, and how to read them
The animal studies mostly report that a compound reduced lung swelling, inflammation markers or tissue damage compared with injured animals that did not get it. Most did not report results as a single headline number. The table lists each experiment with the injury model, what it was compared with and the dose. Doses are given per kilogram of an animal’s weight; they record the experiment and do not convert into a human dose or a guide for anyone.
Filter by how the lung injury was caused in the animals.
| Compound and dose | Injury model | Compared with | What was observed |
|---|---|---|---|
| JWH133, 10 mg/kg into the belly cavity [8] | 95% oxygen, male mice, 6 per group [8] | Mice breathing 95% oxygen without it | All untreated mice died within 96 hours; the compound reduced lung injury and iron-driven cell death by raising GPX4 [8] |
| HU308, 5 mg/kg into the belly cavity [13] | Spike protein piece, 0.5 mg/kg into the windpipe, mice, checked at 48 hours [13] | Injured mice without it | Less lung injury, fewer neutrophils and NETs [13] |
| HU308, 5 mg/kg into the belly cavity [6] | CEES, 6 mg/kg into the windpipe, mice, checked at 48 hours [6] | Exposed mice without it | Less injury and inflammation; 5 mg/kg worked best of the doses tried [6] |
| HU-308, 3 mg/kg into a vein [15] | Bacterial toxin into the nose, mice, 5 per group [15] | Untreated mice, and dexamethasone 0.1 mg/kg [15] | Less inflammation throughout the body [15] |
| JWH133, 5 mg/kg [14] | Pseudomonas aeruginosa bacteria into the lungs, mice [14] | Infected mice without it | Less lung injury and inflammation; blocking CB2 canceled the effect [14] |
| JWH133, 3 mg/kg [17] | Toxin-induced sepsis, 48 rats, over 6 hours [17] | Septic rats without it | Eased lung injury [17] |
| JWH133, 5 and 20 mg/kg into the belly cavity [18] | Paraquat 20 mg/kg, 96 rats, checked at 72 hours [18] | Poisoned rats without it | Less lung swelling and inflammation [18] |
| Carmofur, 3 and 10 mg/kg by mouth [20] | Bacterial toxin, mice [20] | Injured mice without it | Eased injury; the drug lasted about 45 minutes in lung tissue [20] |
| JZL184, 16 mg/kg [19] | Bacterial toxin, mice [19] | Injured mice, and mice also given CB1 or CB2 blockers | Reduced lung injury; blocking the receptors weakened the effect [19] |
No rows match this filter.
Why a mouse is not a patient
- Several studies used male animals only, so nobody knows if females respond the same [8][13].
- The injury was caused on purpose with toxin, oxygen or chemicals, which is not the same as ARDS from pneumonia or sepsis in a person [15].
- Compounds were often given before or at the moment of injury; patients reach the hospital hours or days later [18].
- Routes such as injection into the belly cavity or straight into the windpipe are not how anyone uses cannabis [8][6][12].
- The most promising molecules, JWH133, HU308 and CS-85, are research tools, not products you can buy [8][13][12].
Lab compounds vs. products you can buy · What science doesn’t know yet
Lab compounds, prescription cannabinoids and what a medical card actually covers
Three very different things hide behind the word cannabinoid. Mixing them up is the fastest way to read a mouse study as advice.
Lab only
Research compounds
JWH133 and HU-308 switch on CB2 alone [8][15]; CS-85 is a new molecule built from a CBD-like base [12]; carmofur and JZL184 block enzymes [20][19]. None is sold to patients, and none has been tested in people with ALI.
Prescription
FDA-approved cannabinoids
Dronabinol (Marinol, Syndros), nabilone (Cesamet) and cannabidiol (Epidiolex) are pharmacy medicines with set doses. None is approved for lung injury, and they are not bought with a medical card.
With a medical card
State-program products
THC and CBD from the cannabis plant, in tested and labeled amounts. A risk or effect of THC does not carry over to a CBD-only product, and the reverse is also true.
Saw one of these names in a headline?
Tap a name to see what it is, where it exists and whether it was studied in lung injury.
JWH133. A synthetic research compound that acts on CB2 only. Studied in mice and rats with lung injury from oxygen, bacteria, sepsis and paraquat [8][14][18]. Not a medicine and not a cannabis product.
HU-308. Another synthetic CB2-only research compound. Studied in mice injured by bacterial toxin, a spike protein piece and a mustard-gas analog [15][13][6]. Not sold to patients.
CS-85. A new molecule derived from a CBD-like compound that blocks the TRPV4 channel. Tested only in mice, given straight into the windpipe [12]. It is not CBD oil.
Carmofur. An old cancer drug that also blocks two enzymes that break down the body’s own cannabinoid-like molecules. Eased lung injury in mice [20]; never tested for this in people.
Dronabinol. A prescription form of THC approved for nausea from chemotherapy and appetite loss in AIDS. Not approved or studied for acute lung injury.
Epidiolex. Prescription purified CBD for certain seizure disorders. Its label lists interactions with other medicines through liver enzymes [11]. Not approved for lung injury.
THC. The main active compound of cannabis, acting mostly on CB1. No study on this page tested THC for acute lung injury. Sold in state programs in many forms.
CBD. A cannabis compound that does not cause a high. No study on this page tested plain CBD in lung injury; the one CBD-related result is the lab molecule CS-85 [12].
Smoking, vaping, edibles, tinctures or topicals after lung injury: what each form avoids and what stays
Medical cannabis is not only smoked. It is vaped, eaten, swallowed as capsules, dropped under the tongue, rubbed on skin or worn as a patch. No study here compares forms in people after lung injury, so none is ranked as gentler. What can be said is what each form avoids and what it still brings. The choice of form, or of none, is for you and your physician, not for this page.
Which form are you asking about?
The notes that hold for every form are always shown; a chosen form adds its own notes above them.
Smoking: joints, blunts, pipes, bongs
Burning plant matter sends smoke and heat into airways that are still healing, the exact tissue ALI damaged. Shared joints and pipes also pass germs, and a new chest infection is a common reason for setbacks after ARDS.
Vaping and dabbing
Heating instead of burning removes smoke, not aerosol. Cartridges of unknown origin are where vitamin E acetate turned up in the EVALI outbreak [7], and concentrates for dabbing are strong enough that a small slip is a large dose.
Edibles, drinks and capsules
Nothing reaches the airways, but the effect starts late and lasts for hours, and the liver processes the dose before it reaches the blood. A second helping taken because “nothing happened yet” is a common route to taking too much, and heavy sedation slows breathing.
Tinctures, oils and mouth sprays
Held under the tongue or sprayed into the cheek, they skip the lungs and are measured in drops or sprays. Part of each dose is swallowed and passes through the liver, so interactions stay the same as with edibles.
Creams, balms and patches
Creams and balms act mostly where they are applied. Transdermal patches are different: they deliver cannabinoids into the blood, so drowsiness and interactions are the same questions as for anything swallowed.
Prescription cannabinoids: dronabinol, nabilone, Epidiolex
FDA-approved medicines with fixed doses, filled at a pharmacy, not bought with a medical card. None is approved for lung injury, and their labels list the interactions your prescriber checks [11].
True of every form
- THC and CBD reach the bloodstream and can interact with medicines started in the hospital.
- THC can cause drowsiness, a fast heartbeat and dizziness; with sedatives or opioids it can slow breathing.
- THC and CBD differ: a risk of one does not automatically apply to the other.
- Only tested, labeled products tell you what you are actually taking.
- Do not drive after using THC.
All forms as a table
| Form | Reaches the airways? | What it keeps | Studied for ALI in people? |
|---|---|---|---|
| Smoking | Yes, smoke and heat | Every THC effect, interactions, shared devices | No |
| Vaping and dabbing | Yes, hot aerosol | Unknown additives in untested cartridges, strong doses, interactions | No |
| Edibles and capsules | No | Late onset, long effect, liver processing, interactions | No |
| Tinctures and sprays | No | Part swallowed, interactions, drowsiness | No |
| Creams and balms | No | Skin reactions | No |
| Transdermal patches | No | Cannabinoids in the blood, interactions, drowsiness | No |
| Prescription cannabinoids | No | Side effects and interactions on the label | No |
Is cannabis safe after acute lung injury? Side effects, timing and who should avoid it
No study has followed people who used cannabis after acute lung injury, so there is no measured safety record for this group. What is known are the general effects of THC and CBD, and several of them press on exactly the systems that are recovering after ARDS.
Drowsiness
THC sedates. On top of sleeping pills or pain medicines given after the ICU, it can leave you confused or hard to wake.
Slower breathing with sedatives
Sedation plus opioids or benzodiazepines can make breathing shallow. With lungs that have less reserve, that margin matters.
Fast heartbeat and anxiety
THC commonly speeds up the heart and can trigger anxiety or panic, which can feel like the breathlessness you fear.
Dizziness and falls
A drop in blood pressure on standing, plus ICU weakness, makes falls more likely in the first weeks home.
Smoke and vapor
Any inhaled form puts heat and irritants on airways that are still healing; vapes of unknown origin carry the EVALI risk.
Driving
THC slows reactions, and sedating medicines make it worse. Do not drive after using it.
Timing
Not in the acute phase, and not while you are on a ventilator or new oxygen. Not alongside home oxygen without the lung doctor knowing, and never smoked anywhere near an oxygen supply, which is a fire risk. Tell the team about any cannabis or CBD before procedures and anesthesia, because it can change how sedatives work.
Who should not use cannabis, or only with the care team
- Anyone still in the acute phase: in the ICU, on a ventilator or getting worse.
- People who are pregnant or breastfeeding.
- Anyone with a personal history of psychosis, or of cannabis use disorder (coded F12 on records).
- People with serious heart disease or rhythm problems, or with severe liver disease.
- Older adults at high risk of falls, especially soon after discharge.
- Anyone whose lung injury followed vaping or a product of unknown origin.
Never stop or change a prescribed medicine to make room for cannabis. Changes go through the doctor who prescribed it.
Drug interactions: sedatives, opioids, steroids, blood thinners and antifungals
After an ICU stay, many people go home with a new medicine list: sedatives being tapered, pain medicines, steroids, blood thinners, sometimes antifungals. That is exactly when an extra substance is hardest to fit in. The lung studies on this page did not test any of these combinations, so every entry below is general pharmacology, marked as such, for your physician and pharmacist to check against your own list.
What is on your medicine list?
With the discharge list or the pharmacy printout in hand, tap each group you take; the matching notes open.
Midazolam, propofol, dexmedetomidine general pharmacology
These are given in the ICU and sometimes during procedures. Regular cannabis use can change how much sedation is needed, so the team should know about it before any procedure. Their sedating effects add to those of THC.
Benzodiazepines and sleeping pills general pharmacology
Lorazepam, alprazolam, zolpidem and similar drugs add drowsiness to THC and raise the risk of falls, confusion and slow breathing. More in mixing cannabis and Xanax.
Opioid pain medicines general pharmacology
Oxycodone, hydrocodone, morphine and others can slow breathing on their own. Adding a sedating substance increases that risk in lungs with little reserve; dose changes go through the prescriber.
Corticosteroids general pharmacology
Prednisone and dexamethasone are partly cleared by the liver enzyme CYP3A4, which CBD can affect [11]. Steroids also raise blood sugar and affect mood and sleep, so new symptoms are harder to read when something else is added.
Warfarin and other blood thinners general pharmacology
Blood clots are common after an ICU stay, so many people leave on a blood thinner. Warfarin is cleared by CYP2C9 and CYP3A4, enzymes CBD can slow, which could raise its effect and the bleeding risk [11]. Ask for an INR check before and after any change.
Azole antifungals and macrolide antibiotics general pharmacology
Fluconazole, voriconazole, clarithromycin and erythromycin block CYP3A4 and can raise the blood levels of THC and CBD, so the same product may hit harder [11].
No entries match this filter.
Questions to ask about your medicine list
- Which of my medicines are being tapered, and when do they stop?
- Would THC or CBD change the level of my blood thinner, steroid or antifungal?
- Which of my medicines already make me drowsy or slow my breathing?
- Which blood tests should be repeated if I start or stop something new?
A pharmacist can review a full list, including supplements and over-the-counter pills, and flag risky pairs.
What science doesn’t know yet about cannabinoids and acute lung injury
The gaps are bigger than the findings, and the authors of these studies say so themselves.
- No clinical trial has tested cannabis, CBD or any cannabinoid as a treatment for acute lung injury or ARDS in people.
- Several experiments used male mice only [8][13].
- Cell work relied on a mouse lung cell line (MLE-12) rather than human lung cells [8].
- Injury was imitated: a single spike protein piece instead of live SARS-CoV-2 [13], a chemical analog instead of sulfur mustard [6], bacterial toxin instead of a live infection [15].
- The sepsis study in rats lasted 6 hours, far shorter than a patient’s illness [17].
- How these compounds behave in the human body, by mouth or inhaled, and whether they are safe long term, has not been studied [12][13].
- No one knows a dose, a form or a safe time to start for people recovering from ARDS.
Three questions for any headline about cannabis and the lungs
- Who was tested? Mice, rats and cells are where every lung-injury result so far comes from.
- What was given? A lab molecule such as JWH133 is not the cannabis or CBD sold in a dispensary.
- How did it get in? A compound dripped into a mouse’s windpipe says nothing about smoke or vapor in a person.
Until trials in people exist, cannabinoids are not a treatment for acute lung injury. If an article skips these three answers, bring it to your appointment as a question, not as a plan.
How to talk to your doctor about cannabis after ARDS
Start with the people who know your lungs: the pulmonologist, the post-ICU follow-up clinic if your hospital has one, or your primary care doctor. Tell them about any cannabis or CBD, past or planned, even if it feels awkward. It changes nothing about your care except making it safer, and they hear the question more often than most patients think.
What to bring
Tap each item once it is in your folder.
Questions worth asking
- Are my lungs stable enough to consider anything new, and when should I ask again?
- Is any inhaled form off the table for me, given what my lungs went through?
- Would THC or CBD affect any medicine I take now?
- Is there a reason in my case, such as oxygen at home, heart rhythm problems or past psychosis, to avoid it completely?
- Which symptom, pain, sleep or anxiety, is worth targeting first, and with what?
- If I go ahead, what should we check, and when?
What not to expect
A treatment for the lung injury itself. No doctor can offer cannabis for healing lungs, because no study in people supports it. What a physician can weigh is whether a symptom you live with now might be eased, and at what risk.
Does acute lung injury qualify for a medical card? What decides it in your state
Rarely on its own. Acute lung injury and ARDS are short, hospital-treated illnesses, while state programs list long-lasting conditions, and ALI almost never appears on those lists by name. What usually matters is a lasting condition written in your records, or a state rule that lets the physician use judgment. The list in force on the day of your appointment is the one that counts.
Rarely named
ALI or ARDS itself
Not a typical qualifying condition. Expect the physician to look past the episode to what you live with now.
Related diagnosis
A condition in your records
Chronic pain, PTSD, severe nausea or another listed diagnosis can be the basis, if a doctor has written it down.
Physician judgment
States with an open clause
Some programs let the physician certify a serious or debilitating condition that is not on the list.
What else is in your medical records?
Programs count diagnoses written in your records, not symptoms alone. Choose what applies.
Chronic pain. Listed in some form by many programs. Pain after a long ICU stay is common; bring the diagnosis and what you have already tried.
PTSD or anxiety. PTSD is on many state lists; anxiety on fewer. Symptoms after the ICU are real, but the program needs a written diagnosis.
Insomnia. Rarely listed by itself. Read what is known in is cannabis good or bad for sleep.
COPD. A lung disease where inhaled forms are a particular concern. The research is in COPD and medical cannabis.
Sepsis. A past episode is not a qualifying condition by itself; the research is in sepsis and medical cannabis.
None of these. The answer then depends on how your state words its rules and on the physician. Start with medical marijuana laws by state, or read getting a card without a listed condition.
What a medical card changes
Who looks at your health first
With a medical card
A licensed physician reviews your lung history and medicines.
Buying without one
Nobody does.
What you know about the product
With a medical card
State-tested products with THC and CBD on the label, including forms that are not inhaled.
Buying without one
In states without adult sales, only untested sources, the kind tied to EVALI.
Taxes
With a medical card
In some states patients skip part of the cannabis tax.
Buying without one
The full tax, where adult sales are legal at all.
Limits
With a medical card
Often higher purchase and possession limits, set by state rule.
Buying without one
The adult limit, or none legally.
Each state sets its own condition list, limits, taxes and home-grow rules; look yours up in medical marijuana laws by state. How patient taxes differ is laid out in medical vs recreational cannabis taxes.
Getting a medical card for symptoms after lung injury: how it works
The evaluation happens from home with a physician licensed in your state, one on one. Here is the order of things; the details are on the medical card page.
-
About 5 minutes
Fill in the form
Your state, your diagnoses, the lung injury and ICU stay, and every current medicine. Upload the discharge summary if you have it.
-
About 15 minutes
Meet the physician
An online appointment, nothing to travel to. You agree on the time with the physician, who may run behind with an earlier patient, so keep an hour free around it.
-
In as little as 15 minutes after the appointment, depending on your state
Signed recommendation
Issued only when the physician judges it right for you; you then find it in your account.
-
Timing set by the state
State registration
Where the state runs a registry, you apply there and the state issues the card on its own schedule.
Across 250 reviews from patients in the states where we are licensed. We do not sort them by score and do not hide the low ones.
- 150,000+patients evaluated – everyone who has been through an appointment with us, in every state where we are licensed
- Since 2017doing only this: online evaluations for medical cannabis programs, and nothing else on the side
You see the price for your state before paying; any state fee goes to the state. A recommendation is never promised in advance, and the medical card FAQ explains what happens to the payment if one is not issued. Reduced prices exist for veterans and for people on a low income. Already booked? Move the time on your appointments page or find your documents in your account.
Our physicians are listed on the doctors page. Sudden or severe breathlessness needs 911, not an online appointment.
Acute lung injury and cannabis: frequently asked questions
What is acute lung injury in simple terms?
A sudden inflammation of both lungs that makes the air sacs leak fluid, so oxygen cannot get into the blood. It follows another illness or injury, such as pneumonia, sepsis or a transfusion, and is treated in the hospital. See the full definition.
What are the first signs of acute lung injury?
Breathlessness that keeps getting worse over hours, fast breathing and a fast heartbeat, usually within days of the trigger. Blue lips, confusion or low oxygen readings mean calling 911; see symptoms and warning signs.
Is acute lung injury the same as ARDS?
Nearly. They are the same process at different severity. Since the 2012 Berlin definition, what was called acute lung injury is classed as mild ARDS [2]; the comparison shows how the definitions changed.
What is the ICD-10 code for acute lung injury?
There is no separate code named acute lung injury; ALI and ARDS are usually coded J80. TRALI has its own code, J95.84, and vaping-related injury is U07.0 [4]. The code table lists the rest.
How long does a lung injury take to heal?
Weeks in the hospital and months at home are typical. Many people regain most lung function within a year, while weakness, fatigue and breathlessness can last longer [3]. See recovery after ARDS.
How long does lung inflammation last?
The acute inflammation of ALI usually settles over one to a few weeks as the lungs move into repair. In some people repair leaves scar tissue, which is a lasting change rather than ongoing inflammation; see the phases of injury.
Can acute lung injury be cured?
The lungs often heal well once the cause is treated, though not in everyone. There is no drug that cures ALI; care supports breathing while the body recovers [3].
What causes transfusion-related acute lung injury?
Is pneumonia an acute lung injury?
Not by itself. Pneumonia is an infection in part of a lung and the most common cause of ALI; it becomes ALI or ARDS when the injury spreads to both lungs and oxygen drops past set limits [2].
Can vaping cause acute lung injury?
Has cannabis or CBD been tested for acute lung injury in people?
No. Every result comes from mice, rats and cells, mostly with lab compounds such as JWH133 and HU-308 [8][6]. See what the research shows.
Can I use medical cannabis while recovering from a lung injury?
Only as a decision with your doctor, and not in the acute phase. Smoke and vapor load healing airways; forms that are not inhaled avoid the airways, but THC effects, liver processing and interactions remain with any form. See what each form avoids and keeps.
Is CBD safe after ARDS?
That has not been studied in people. CBD can change the levels of medicines such as warfarin and some steroids through liver enzymes [11], so check with your doctor first. A CBD vape is still a vape.
Does ARDS qualify for a medical marijuana card?
Rarely by itself. A related diagnosis in your records, such as chronic pain or PTSD, or a state rule that allows physician judgment, is the usual route. See what decides it in your state.
After I get recommended, can I go straight to a dispensary?
It depends on your state. In some, the signed recommendation is enough; in others you first register with the state program and wait for the card. Your state’s page in laws by state and the medical card FAQ explain the next step.
More research on cannabis and acute lung injury
This page cites a selection of studies. Our research library holds every study we track on cannabis and acute lung injury, from laboratory work to clinical trials, and lets you filter them by cannabinoid, study type and year.
- studies
- 63
- in people
- 22
- clinical trials
- 0
Talk to a licensed physician about your recovery symptoms
What cannabis cannot do here: treat acute lung injury or help injured lungs heal.
What a physician can do: look at your recovery, your medicines and your state’s rules, and tell you whether medical cannabis makes sense for the pain, sleep or anxiety you live with now.
Your state’s price is on screen before you pay, and approval depends on the physician’s judgment. Sudden or severe breathlessness, blue lips or confusion: call 911 instead.
Share your experience
References
22 sources
- 1. American Thoracic Society. The American-European Consensus Conference on ARDS: definitions, mechanisms, relevant outcomes, and clinical trial coordination. 1994.
- 2. ARDS Definition Task Force. Acute respiratory distress syndrome: the Berlin Definition. 2012.
- 3. National Heart, Lung, and Blood Institute. ARDS: treatment and recovery. 2022.
- 4. Centers for Disease Control and Prevention, National Center for Health Statistics. ICD-10-CM: International Classification of Diseases, Tenth Revision, Clinical Modification. 2026.
- 5. American Thoracic Society. A new global definition of acute respiratory distress syndrome. 2024.
- 6. Cannabinoid-2 Receptor Activation Attenuates Sulfur Mustard Analog 2-Chloroethyl-Ethyl-Sulfide-Induced Acute Lung Injury in Mice. DOI: 10.3390/ph18020236 PMID: 40006049
- 7. Centers for Disease Control and Prevention. Outbreak of lung injury associated with the use of e-cigarette, or vaping, products. 2020.
- 8. CB2 receptor agonist JWH133 attenuates hyperoxia-induced acute lung injury by inhibiting ferroptosis via GPX4 upregulation. DOI: 10.1186/s12931-026-03680-9 PMID: 42046071
- 9. Transfusion (AABB). A consensus redefinition of transfusion-related acute lung injury. 2019.
- 10. Formation of Redox-Active Duroquinone from Vaping of Vitamin E Acetate Contributes to Oxidative Lung Injury. DOI: 10.1021/acs.chemrestox.1c00309 PMID: 35077135
- 11. U.S. Food and Drug Administration. Epidiolex (cannabidiol) prescribing information. 2018.
- 12. Discovery of a novel cannabidiol-derived transient receptor potential vanilloid 4 inhibitor to reduce pulmonary edema and lung vascular permeability in mice. DOI: 10.1186/s11658-026-00939-3 PMID: 42144577
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