COPD and Medical Marijuana: What the Research Shows
Chronic obstructive pulmonary disease (COPD) narrows the airways for good, so with medical cannabis the way it enters the body matters more than almost anywhere else. Smoke and hot vapor travel down airways that are already damaged; every form that contains THC can still cause drowsiness and interact with other medicines; and whether cannabis has any place in your care is a decision to make with a physician who sees your full medicine list.
Built on peer-reviewed research published from 1976 to 2026: trials in people, observational and population studies, case reports and laboratory work
When every breath takes effort: living with COPD
Most people with COPD can name the moment they noticed. The stairs that used to be nothing. The walk from the parking lot that now needs a stop halfway. Nobody else sees it, and that is part of what makes it hard: you look fine, and you are working for every breath.
Breathing that runs out first
Shortness of breath, which doctors call dyspnea, starts with effort and slowly moves closer to rest. Carrying groceries, showering, getting dressed in a hurry: each one can leave you leaning on a counter. Many people quietly shrink their days to fit their lungs, skipping the trip, the party, the grandchild’s game. That retreat is a symptom too, and it tends to make breathing worse, because muscles that are not used need even more oxygen when they are.
The cough and mucus that greet the morning
A cough that brings up phlegm most mornings is often the first sign, and it is easy to wave off as a smoker’s cough. It is not harmless. Thick mucus blocks narrowed airways further, and a cough that changes, with more phlegm, a darker color or blood, is one of the signals that a flare-up is starting.
Nights, worry and the fear of being judged
Lying flat can make breathing harder, so sleep breaks into pieces. Waking up short of breath is frightening, and fear itself speeds up breathing. Anxiety and low mood are common in COPD: one review counts psychiatric conditions in 28.4% of people with COPD against 2.7% of people without it [2]. Add the inhalers that do not seem to help enough, the side effects of steroids, and the feeling that a doctor might hear “cannabis” and think less of you, and it is no surprise that people go looking for something else.
If that is why you are here, you deserve a straight answer, not a sales pitch. This page lays out what has actually been tested, what it found, and what nobody knows yet.
Chronic obstructive pulmonary disease: meaning and definition
Chronic obstructive pulmonary disease (COPD) is a long-term lung disease in which the airways narrow and the tiny air sacs lose their stretch, so air gets trapped and breathing out takes effort. It develops over years, most often after smoking or breathing fumes and dust, and the damage does not fully reverse.
In plain terms: “chronic” means it lasts, “obstructive” means air has trouble getting out, and “pulmonary” means the lungs. COPD is not one single disease but an umbrella over two main patterns, which often appear together in the same person.
Emphysema
What it is: damage to the air sacs at the end of the airways, where oxygen passes into the blood.
What happens in the lungs: the walls between the sacs break down, leaving fewer, larger, floppy spaces that trap stale air.
How it feels: breathlessness on effort that slowly grows, often with little cough.
Chronic bronchitis
What it is: long-lasting inflammation of the bronchial tubes that carry air in and out.
What happens in the lungs: the lining swells and makes extra mucus, which narrows the tubes further.
How it feels: a cough with phlegm on most days for months at a time, year after year.
Cigarette smoking is the leading cause in the United States, but not the only one. Years of dust, chemical fumes or smoke at work, smoke from cooking and heating fires, frequent childhood lung infections and a genetic condition called alpha-1 antitrypsin deficiency, where the body lacks a protein that shields the lungs, can all lead to COPD. Some people with long-standing asthma develop fixed narrowing too.
Quick answers
What is the ICD-10 code for COPD?
J44.9 is “chronic obstructive pulmonary disease, unspecified,” the code you will most often see on records and referrals. Related codes describe a flare-up (J44.1, with acute exacerbation) or a COPD lung infection (J44.0, with acute lower respiratory infection), and emphysema has its own group, J43. The code on your records is what a physician reads at a medical card evaluation.
What is COPD called in Spanish?
EPOC, short for enfermedad pulmonar obstructiva crónica. You may see it on records from Spanish-speaking clinics or family members’ paperwork; it is the same diagnosis.
COPD is characterized by what?
By airflow limitation that does not fully go away with an inhaler, together with lasting symptoms: breathlessness, cough, phlegm, or all three. A breathing test called spirometry confirms it by measuring how much and how fast you can blow air out.
Can young adults or children get COPD?
It is uncommon. COPD is usually diagnosed after 40. In younger adults, doctors look for alpha-1 antitrypsin deficiency, heavy early smoking or vaping, or lung damage from childhood illness. In children, a chronic cough points to other conditions far more often.
COPD symptoms, flare-ups and life expectancy
The common signs and symptoms of chronic obstructive pulmonary disease are shortness of breath on effort, a cough that lasts, phlegm, wheezing, a tight chest, tiredness and frequent chest infections. Later on, some people lose weight and notice swollen ankles. Doctors grade the airflow limitation in four GOLD stages using spirometry; how you feel and how often you have flare-ups count just as much in planning treatment.
What bothers you most?
Pick one to compare it across the stages; nothing here tells you which stage you are in.
| Stage | Breathing | Cough & mucus | Daily activity | Sleep & mood |
|---|---|---|---|---|
| Mild (GOLD 1) | Short of breath only when hurrying or climbing; often put down to age or fitness. | A morning cough with some phlegm, or none at all. | Life goes on as usual; many people do not know they have COPD yet. | Usually unaffected. |
| Moderate (GOLD 2) | Breathless walking on level ground at your own pace; this is when most people see a doctor. | Cough and phlegm most days; colds settle on the chest. | Stairs, yard work and carrying bags take planning and rests. | Some night coughing; worry about the next chest infection. |
| Severe (GOLD 3) | Breathless after a short walk or while dressing. studied in cannabinoid research | Thick mucus that is hard to clear; flare-ups more frequent. | Help needed with heavier tasks; trips out shrink. | Broken sleep; anxiety and low mood become common. |
| Very severe (GOLD 4) | Breathless at rest or with the smallest effort; home oxygen is often needed. studied in cannabinoid research | Weak cough that struggles to move mucus; infections hit hard. | Washing and dressing may need help; much of the day is spent seated. | Waking breathless at night; panic around breathing is common. |
Flare-ups
A flare-up, or exacerbation, is a stretch of days when symptoms get clearly worse than your usual: more breathlessness, more phlegm, a change in its color. Infections and air pollution are common triggers. Flare-ups are the moments that most often land people in the hospital, and each one can leave the lungs a little weaker. Tracking how you feel week to week helps spot them early.
Get emergency care for breathlessness that is much worse than usual even at rest, lips or fingertips turning blue or gray, confusion or unusual drowsiness, chest pain, or a fast heartbeat that does not settle. These are not signs to treat at home with anything new.
How long do people live with COPD?
Can COPD kill you? It can shorten life, usually through severe flare-ups, lung infections and the strain it puts on the heart. But there is no single number for life expectancy. It depends on the stage, whether you still smoke, how often you have flare-ups, your weight and fitness, and other conditions such as heart disease. Many people with mild or moderate COPD live for decades. Quitting smoking, pulmonary rehabilitation and preventing infections change the outlook more than anything else on this page.
Could medical cannabis be worth discussing for your COPD?
Fourteen short questions about your diagnosis, your breathing, how you use tobacco or cannabis now and the medicines you take. Your answers stay on this page and show what to bring to a physician.
14 questions · about a minute · your answers stay in this browser
Chronic obstructive pulmonary disease treatment
COPD treatment aims at three things: slowing the damage, making breathing easier day to day, and preventing flare-ups. Nothing on the list below is replaced by cannabis, and most of it works better the earlier it starts. A pulmonologist (lung specialist) or primary care doctor tailors the mix to your stage and symptoms.
Quitting smoking
The single step that slows the loss of lung function at any stage. Counseling, nicotine replacement and prescription aids together work better than willpower alone, and it is never too late to stop.
Bronchodilator inhalers
Medicines that relax the muscles around the airways so more air gets out. Short-acting ones are rescue inhalers; long-acting ones are taken daily to keep breathing easier.
Inhaled steroids
Added for people who keep having flare-ups, usually combined with a long-acting bronchodilator in one inhaler. Steroid tablets are reserved for short courses during a flare-up.
Pulmonary rehabilitation
A supervised program of exercise, breathing techniques and education. It eases breathlessness, builds stamina and confidence, and cuts hospital visits.
Oxygen therapy
Prescribed when blood oxygen stays low, often in very severe COPD. Used for enough hours a day, it can lengthen life. Oxygen feeds fire, so open flames near it are dangerous.
Vaccines and an action plan
Flu, pneumonia, COVID-19 and RSV vaccines lower the risk of infections that trigger flare-ups. A written action plan tells you what to start and whom to call when symptoms change.
Surgery, such as removing the most damaged lung tissue or placing valves, and lung transplant are options for a small group with very severe emphysema. Whatever you add on top of your treatment, a supplement, an herbal remedy or cannabis, belongs in a conversation with the doctor who manages your lungs, because it can change how your other medicines work.
Can cannabis help with COPD symptoms?
Possibly, for one symptom, and so far the evidence leans against it. The symptom is severe breathlessness, and the only finished trial found no relief from THC capsules [1]. For airway inflammation, anxiety and sleep, there is no trial in people with COPD at all.
Why researchers looked in the first place: the body has its own cannabinoid system, a network of receptors and signaling molecules. Cells lining the airways of people with and without COPD carry parts of it [7], and the main THC receptor, CB1, sits in brain areas that shape how breathlessness feels. The idea behind current trials is to dull that sensation in the brain, not to open the lungs [3]. More on that system in how the endocannabinoid system works.
Choose one symptom to see what was tested.
Breathlessness
Dronabinol capsules raised to at most 20 mg a day against placebo, in a crossover trial in which 11 people with COPD completed both arms [1]. A larger Danish trial in severe COPD is under way [3].
Two small trials, one finished. The finished one was a pilot with a high dropout rate.
No relief of breathlessness in the finished trial; the open question now rests on the new one.
Airway inflammation
A cannabis oil extract added to human small-airway cells in a dish, measuring immune response genes [8].
Cell studies only, in the laboratory. Nothing was given to people.
Changes in cells in a dish do not show that anything calms inflamed airways in a person.
Anxiety & mood
Nothing in COPD. Reviews describe how common anxiety and depression are in COPD and recommend asking about cannabis use and mental health history [2].
Background only; no cannabinoid trial for anxiety in people with COPD.
THC can calm some people and make others more anxious. See anxiety and medical cannabis.
Sleep
Nothing in people with COPD.
No data. Feeling drowsy is not the same as sleeping better, and sedation matters more when breathing is weak.
Read more on whether cannabis is good or bad for sleep.
Nothing was tested for this symptom.
Records studies add a different kind of data. In US hospital stays for COPD, people whose charts noted cannabis use had lower odds of dying in the hospital and of pneumonia than people whose charts did not [9]. A chart cannot say why: users were different people to begin with. The numbers are in how big the effects were.
A licensed physician looks at your symptoms and medicines before any recommendation: see how the evaluation works.
Cannabis and COPD: does the form matter?
Can you smoke cannabis with COPD? Smoke is the part with the clearest harm: it carries combustion products down airways that are already narrowed and inflamed, and regular smokers report more symptoms of chronic bronchitis [10]. Vaping avoids burning but still sends hot aerosol through the same airways. Forms that are swallowed, held under the tongue or put on the skin avoid the airways, yet THC still reaches the brain and the liver. This section explains those differences; it does not recommend a form.
Composition is a separate question from form. THC is the compound that changes how you feel; CBD does not cause a high; many products contain both. The drowsiness of THC says nothing about a CBD-only oil, and the reverse.
How is it used, or how would it be?
Choose the closest; most people combine more than one.
Specific to smoking
Joints, blunts, pipes and bongs burn plant material. Cannabis smoke contains tar and irritants such as phenols, aldehydes and acrolein, and long-term smoking is linked to swollen, mucus-producing airway linings [11]. Deep inhaling and breath-holding add to the load. A joint near home oxygen is a fire risk.
Specific to vaping and dabbing
Dry-herb vaporizers, oil pens and cartridges avoid burning, but hot aerosol still travels the same airways. Dabbing heats concentrates such as wax or shatter, which are very strong and hard to dose. Almost no research has looked at vaping cannabis in COPD [12].
Shared devices
A joint, pipe or vape passed between people also passes on colds, flu and other respiratory infections, the most common trigger of COPD flare-ups.
Specific to edibles and capsules
Gummies, chocolates, drinks, capsules and swallowed oils avoid the airways entirely. They take an hour or more to act and last for hours, and the liver processes them before they reach the blood. The classic mistake is a second dose “because the first did nothing,” followed by heavy sedation hours later.
Specific to tinctures and sprays
Drops held under the tongue and mouth sprays avoid the lungs and are measured by the drop or spray. Part of each dose is still swallowed, so the liver and the effects on the brain remain.
Specific to topicals and patches
Creams and balms act mainly where they are applied and are not a way to treat breathing symptoms. Transdermal patches are different: they deliver cannabinoids into the bloodstream, so drowsiness and drug interactions count as with any other form.
Specific to prescription cannabinoids
Dronabinol is a capsule with an exact dose, prescribed by a doctor and filled at a pharmacy, not bought with a medical card. It is the form tested in COPD trials, where it did not ease breathlessness [1]. The capsules contain sesame oil.
True of every form
- THC can cause drowsiness, dizziness and confusion; with weak breathing, deep sedation is a real concern.
- It can add to the effect of sleeping pills, sedatives and opioids.
- Whatever reaches the blood is handled by the liver and can change levels of other medicines.
- No driving after use.
- If you use home oxygen, no flame, lighter or burning product anywhere near it.
Choosing a form, or none, is a conversation for the appointment.
All forms as a table
| Form | What it avoids | What remains |
|---|---|---|
| Smoking | Delay in onset | Smoke in narrowed airways, fire risk near oxygen, shared devices, hard-to-measure dose, all effects of THC |
| Vaping & dabbing | Burning plant material | Hot aerosol in the airways, very strong concentrates, shared devices, all effects of THC |
| Edibles & capsules | Smoke and vapor, shared devices | Slow, long effect, risk of a repeat dose, liver processing, sedation, interactions |
| Tinctures & sprays | Smoke and vapor, shared devices | Effects on the brain, partly swallowed dose, sedation, interactions |
| Topicals | The airways and most effects on the brain | Skin reactions; no effect on breathing symptoms |
| Transdermal patches | Smoke, vapor and swallowing | Effects on the brain, sedation, interactions |
| Prescription cannabinoids | Unknown product content | Drowsiness, dizziness, interactions; no benefit for breathlessness in the finished trial |
What smoking cannabis does to damaged lungs
Burning any plant makes smoke, and smoke irritates airways whatever was burned. Cannabis smoke contains carcinogens and irritants such as phenols, aldehydes, acrolein, benzpyrene and benzanthracene. Long-term smoking is linked to more and larger blood vessels in the airway lining, swelling, extra mucus-making cells and more immune cells in the air sacs, all signs of airway inflammation [11]. In COPD, that inflammation lands on airways that already have little room to spare.
A 2025 case report describes a man with severe COPD and large blistered areas of emphysema after daily marijuana smoking for upwards of 35 years [11]. Another describes late-diagnosed bullous emphysema in a man who smoked cannabis, tobacco and Datura cigarettes [13]. Single cases cannot prove cause, but they show what the worst end looks like.
Smoke
What reaches the airways: combustion products, tar and fine particles, often held in with a deep breath.
What studies recorded: more cough, phlegm and chronic bronchitis symptoms in regular smokers [10]; mixed findings on long-term airflow loss.
What is unknown: how much smoke a person who already has COPD can tolerate, if any.
Hot vapor
What reaches the airways: heated aerosol from flower or oils, without burning, plus whatever the liquid contains.
What studies recorded: in cannabis users with COPD, almost nothing. A study of nicotine e-cigarettes found flavoring can change how many particles reach the lungs [14].
What is unknown: nearly everything about regular cannabis vaping in damaged lungs.
Many people with COPD who use cannabis also smoke tobacco, and the two habits travel together. In a national US survey, adults with COPD were more likely than other adults to smoke cigarettes and to use smokeless tobacco [15]. The researchers’ advice was to treat quitting smoking as the standard of care and to watch for psychological distress and other substance use. Tobacco and cannabis mixed in one joint, as in a blunt or spliff, combines both harms.
How the lung function study was done
SPIROMICS followed current and former tobacco smokers, with and without COPD, and repeated their breathing tests over years. Lifetime marijuana smoking was counted in joint-years (one joint a day for a year equals one joint-year) from what participants reported. The authors note that this measure is crude and did not capture vaping, edibles or bongs [12]. Because nearly everyone had smoked tobacco for decades, any extra effect of cannabis would be hard to see.
Effects of cannabis on COPD: what studies found
Not all studies count the same. A randomized trial, where people get either the real treatment or a placebo by chance, answers “does it help?” far better than a hospital database, a single case or cells in a dish. For cannabis and COPD, individual small trials exist and point away from a benefit for breathlessness; everything else shows links, harms of smoke, or laboratory signals.
| Level | What exists for COPD | What it can and cannot tell you |
|---|---|---|
| Trials in people | Two small crossover trials of dronabinol for breathlessness: one finished, with no relief compared with placebo [1]; one still running, with no results yet [3]. | Can show a symptom effect and side effects; so far too small to rule a modest benefit in or out. |
| Observational studies | Hospital records [9], a lung function cohort [12] and a national survey [15], plus background studies of COPD itself. | Show links, not cause; cannabis use is usually self-reported or noted in charts. |
| Case reports | Single patients with severe emphysema after long-term smoking [11][13]. | Show what can happen to one person; cannot say how often. |
| Lab work | Human airway cells exposed to a cannabis oil extract [8]. | Explains why scientists are curious; says nothing yet about patients. |
Browse the studies yourself
Every study cited on this page, in plain words. Neutral and negative results are included, and studies of COPD itself are marked as background.
Dronabinol for breathlessness and quality of life
Up to 20 mg a day of dronabinol did not reduce breathlessness compared with placebo (Borg scale at rest, p = 0.94); 3 of 11 reported dizziness or lightheadedness [1].
Dronabinol for severe breathlessness: the BONG trial
A placebo-controlled trial in severe and very severe COPD, now running; it publishes its plan, not results [3].
Cannabis use noted in COPD hospital stays
Patients whose charts noted cannabis use had lower odds of dying in the hospital (OR 0.62) and of pneumonia (OR 0.88), and no clear difference for sepsis or respiratory failure [9].
Marijuana smoking and lung function in older tobacco smokers
No clear difference in yearly lung function decline between 20 or more joint-years and none; use was self-reported [12].
Substance use among US adults with COPD
Adults with COPD were more likely to smoke cigarettes and use smokeless tobacco, and less likely to drink alcohol, than other adults [15].
The cannabinoid system in the cells that line the airways
Airway lining cells from healthy people and from people with asthma or COPD all carried parts of the endocannabinoid system; the study compared patterns by sex and disease [7].
COPD and recovery after heart bypass surgery
People with COPD had worse long-term outcomes after bypass surgery, a reason for careful planning before any heart operation [16].
Quitting smoking with COPD: women and men
About four in ten women and men with COPD had stopped smoking after attending cessation services (41% and 40.7%) [6].
Menthol flavoring in nicotine e-cigarettes
Menthol changed the aerosol so that more particles reached the airways, and menthol users had worse lung function; this was nicotine vaping, not cannabis [14].
Still smoking at 70 with severe COPD
Current tobacco smokers aged 70 and older showed more oxidative stress and DNA damage than never or former smokers [17].
Lung function in people who smoke heroin
Heroin smokers with COPD or asthma-COPD overlap lost lung function and grew more breathless over follow-up [18].
A rising symptom score warns of flare-ups
Each one-point rise in the COPD Assessment Test went with a higher flare-up risk (HR 1.08, 95% CI 1.03-1.13) [5].
Severe COPD after decades of daily marijuana smoking
One patient developed severe COPD with bullous emphysema after daily smoking for upwards of 35 years [11].
Emphysema found late in a smoker of cannabis, tobacco and Datura
Severe bullous emphysema was diagnosed only when the man arrived with acute breathing trouble [13].
Easing breathlessness in end-stage COPD
Describes breathing support with high-flow oxygen through the nose in a man with end-stage COPD [19].
Does marijuana pose risks for chronic airflow obstruction?
Regular smoking is tied to chronic bronchitis symptoms; evidence on lasting airflow loss is mixed, and self-reported use may hide effects in people under 40 [10].
Herbal and complementary therapies for COPD and asthma
The review identified 62 herbal, nutraceutical and complementary interventions and called them add-ons to proven medicines, not replacements [4].
The mind in COPD
Anxiety and depression are far more common in COPD; the authors urge screening for mental health and cannabis use [2].
Who pays for cannabis research
Lung researchers warn that studies funded by cannabis companies need the same scrutiny once applied to tobacco industry research [20].
Cannabis oil extract and immune genes in airway cells
A standardized extract changed the activity of immune response genes in human small-airway cells in a dish [8].
No studies of this type are cited on this page.
What kinds of studies is this evidence built on?
How to read it: each row is one group of published studies on cannabis and COPD, and the bar shows how many fall into it. Stronger designs are at the top. Gray bars are commentary, animal and cell work, or studies that could not be classified, which cannot answer whether something helps patients.
Show as a table
| Design | Studies |
|---|---|
| Randomized trials | 1 |
| Crossover randomized trials | 2 |
| Cohort studies | 10 |
| Cross-sectional studies | 6 |
| Surveys | 1 |
| Case reports | 3 |
| Narrative reviews | 10 |
| Animal studies | 2 |
| Cell studies | 1 |
| Who was studied | Studies |
|---|---|
| People in clinical trials | 3 |
| People observed, not treated | 8 |
| Whole populations | 8 |
| Cells and molecules | 1 |
| Not classified | 16 |
| Finding | Studies |
|---|---|
| Found the effect or link it looked for | 11 |
| Found no difference | 8 |
| Found a negative result | 8 |
| Mixed results | 5 |
| No conclusion yet | 3 |
How big were the effects in COPD studies?
“Helps” and “harms” are not answers; the size of a difference and how sure researchers are about it are. Only one study of cannabis in COPD reported several outcomes with a margin of error, and it is a records study, not a trial. Here it is in full.
Did people hospitalized with COPD do worse if they used cannabis?
How to read it: each dot is the best estimate of how often an outcome happened in patients whose charts noted cannabis use, compared with patients whose charts did not. The line around it is the likely range (95% CI). The gray vertical line means no difference. A hollow dot means its range crosses that line, so the study cannot tell the groups apart.
Show as a table
| Outcome | Odds ratio | 95% CI | p |
|---|---|---|---|
| In-hospital death | 0.624 | 0.407-0.958 | 0.0309 |
| Pneumonia | 0.882 | 0.806-0.964 | 0.0059 |
| Sepsis | 0.749 | 0.523-1.071 | 0.1127 |
| Acute respiratory failure | 0.995 | 0.877-1.13 | 0.9411 |
Why there is no chart for breathlessness: a chart of effect sizes needs several studies reporting the same outcome with a range. For breathlessness there is one finished trial, and it reported no difference rather than an estimate with a range. The running Danish trial may add the second point [3].
Prescription cannabinoids vs. dispensary products
“Cannabis” in these studies means different things: dronabinol, a lab-made THC capsule; smoked flower; an oil extract dripped on cells. THC is the compound that changes how you feel, CBD does not cause a high, and many dispensary products mix them in different ratios. A result for one does not carry over to another.
Dronabinol (Marinol, Syndros)
What it is: lab-made THC, FDA-approved for nausea from chemotherapy and for weight loss in AIDS [21].
Studied in COPD? Yes, for breathlessness; no relief in the finished trial [1], a second trial running [3].
How you get it: a prescription filled at a pharmacy.
Nabilone (Cesamet)
What it is: a synthetic cousin of THC, FDA-approved for nausea from chemotherapy [21].
Studied in COPD? Not in the studies on this page.
How you get it: a prescription filled at a pharmacy.
Cannabidiol (Epidiolex)
What it is: purified CBD, FDA-approved for certain rare seizure disorders [21].
Studied in COPD? No.
How you get it: a prescription filled at a pharmacy.
Dispensary flower, oils and edibles
What it is: THC, CBD or both, in many forms and strengths, lab-tested and labeled in state programs.
Studied in COPD? Mainly as smoked flower, in observational studies of people who already used it [12][9].
How you get it: at a licensed dispensary, with a medical card where your state requires one.
Cannabis oil extract
What it is: a standardized extract used in research.
Studied in COPD? Only on human airway cells in the laboratory [8].
How you get it: not a product; a research material.
Nothing in this group was studied.
How the dronabinol trials were dosed
In the running Danish trial, dronabinol starts low and rises in 2.5 mg steps to at most 20 mg a day; each person spends 4 weeks on dronabinol and 4 weeks on placebo, with a 2-week break in between [3]. The finished US trial also went up to 20 mg a day [1]. People with a flare-up or infection in the last 30 days, or taking medicines that strongly affect liver enzymes, were not allowed in [3]. These are doses from study protocols, not advice.
What research doesn’t know yet
The data on cannabis and COPD conflict, and the gaps are most of the story. The researchers themselves list the same weaknesses again and again.
- Trials are tiny and people drop out. The finished dronabinol trial was small, single-center and lost many participants along the way [1].
- Most data are looked back on, not tested. Hospital records and surveys rely on charts and memory; they cannot separate cannabis from everything else about the people who use it [9].
- Vaping, edibles and tinctures are almost unstudied in COPD. The largest lung function study counted joints and could not capture other forms [12].
- No long-term outcomes. No study followed people with COPD who use medical cannabis for years to see what happens to flare-ups, hospital stays or survival.
- Drug interactions in COPD are unmeasured. None of these studies tested cannabis together with inhalers, steroids or oxygen, so the absence of reported interactions does not mean there are none.
- The only new trial is still a plan. Its protocol is published, but no patient results are available yet [3].
Chronic obstructive pulmonary disease safety considerations
The same side effect weighs more with severe COPD than in healthy lungs. Drowsiness that a healthy person sleeps off can slow breathing in someone with little reserve; a fast heartbeat matters more when the heart already works hard to push blood through damaged lungs. These are the effects reported for dronabinol, the THC medicine tested in COPD [3][1].
Drowsiness and fatigue
Listed among the known effects of dronabinol [3]. With weak breathing, deep sedation and sleeping pills or opioids together are the combination to avoid.
Dizziness and lightheadedness
Reported by 3 of 11 people while taking dronabinol in the finished COPD trial [1]. Getting up quickly, especially at night, is the riskiest moment for a fall.
Confusion and memory lapses
Known effects of THC [3]. They can make it harder to manage inhalers, oxygen settings and an action plan during a flare-up.
Fast heartbeat and palpitations
Reported with dronabinol [3]. COPD already strains the heart, which is why heart failure is a reason trials keep people out.
Nausea and stomach pain
Along with vomiting, listed for dronabinol [3]. Raised liver enzymes are on the same list and are checked with a blood test.
Anxiety and paranoia
THC can bring on anxiety, paranoia and, rarely, hallucinations [3]. Anxiety already makes breathlessness feel worse in COPD.
Medicines to bring up with a physician
Open each one. This is what the studies recorded, not a complete list.
Strong CYP3A4, CYP2C9 or CYP2C19 inhibitors or inducers excluded from the trial
These are medicines that strongly speed up or slow down the liver enzymes that break down THC, such as some antifungals, antibiotics, seizure medicines and HIV drugs. The Danish dronabinol trial does not accept people taking them [3]. Your pharmacist can check whether anything on your list belongs here.
Sedatives, sleeping pills and opioids general caution
Benzodiazepines such as lorazepam or alprazolam, sleep medicines and opioid pain relievers all slow breathing and add drowsiness. Combined with THC, the sedation can stack up, which matters most when the lungs have little reserve. More on mixing cannabis and Xanax.
Your inhalers and COPD medicines not studied
No study here tested cannabis together with bronchodilators, inhaled steroids, roflumilast or long-term antibiotics. That is a gap, not a green light. Bring the full list, including rescue inhalers and steroid tablets from your last flare-up.
Sesame oil sensitivity excluded from the trial
Dronabinol capsules are made with sesame oil, and people with a known sensitivity to sesame oil or to dronabinol were kept out of the COPD trial [1].
If surgery is planned, heart surgery in particular, tell the surgical team about any cannabis use: people with COPD already need careful planning around operations [16]. In the end, the list of medicines you take decides more about whether cannabis is reasonable than the diagnosis does.
Who should not use cannabis with COPD
For some people the answer is “not now” or “not at all.” Trials of cannabinoids in COPD exclude these groups, so there is no evidence of safety for them.
- A flare-up or chest infection in the last 30 days [3].
- Heart failure that is not under control [1].
- A neuromuscular disease that weakens the breathing muscles [1].
- Known sensitivity to sesame oil or dronabinol [1].
- Pregnancy or breastfeeding: THC reaches the baby, and trials exclude it.
- A history of psychosis or another serious psychiatric disorder, or a substance use problem [3].
- Home oxygen in use where anything would be lit or burned.
Not sure whether any of these apply to you? A licensed physician goes through them with you during the evaluation.
Is COPD a qualifying condition for a medical marijuana card?
It depends on your state. Every medical cannabis program keeps its own list of qualifying conditions, and a physician matches your diagnosis to that list, not to a symptom. A program may name COPD outright, cover it through wording such as “chronic or debilitating condition,” let a physician certify any condition they judge serious enough, or not cover it at all.
The lists change as legislatures and health departments update them, so the current wording for your state is the one that counts. The physician confirms it at the evaluation, using your records.
COPD is named in your state
The simplest case. Bring a record of the diagnosis, ideally a spirometry result or a lung specialist’s note, and the physician evaluates you against that listed condition.
It fits a broader category
Wording such as “chronic,” “debilitating” or “at the physician’s discretion” can cover COPD. Severe breathlessness, frequent flare-ups or oxygen use show how serious it is.
Neither is on the list
A card may still be possible through another diagnosis in your records, or in states that need no listed condition. Read how a card works without a listed condition.
What else has a doctor diagnosed?
State lists name diagnoses, not symptoms: pick what is in your records.
Chronic pain: the most widely listed condition across state programs, and chest wall or joint pain is common with COPD. Read chronic pain and medical cannabis.
Anxiety: several states list anxiety disorders or accept them under broader wording, and they are common with COPD. Read anxiety and medical cannabis.
Insomnia: a diagnosed sleep disorder is listed in some programs. Read insomnia and medical cannabis.
Asthma: listed or covered as a chronic condition in some states; make sure the records say which diagnosis you have. Read asthma and medical cannabis.
None of these: then the decision rests on your state’s wording and the physician’s judgment. Start with your state’s medical marijuana laws.
What documents help
A spirometry report or a pulmonologist’s note that names COPD; a current list of medicines and inhalers with doses; discharge papers from any hospital stay for a flare-up; and, if you use it, the oxygen prescription. Records do not have to be recent to count, but newer ones show the physician how you are now.
Medical marijuana laws by state: legal status, limits, taxes, cultivation
Four things change from state to state, and each one is on your state’s page in medical marijuana laws by state:
- Legal status: medical program only, or medical and adult-use sales side by side.
- Possession and purchase limits for patients, often higher than for recreational buyers.
- Taxes: whether patients pay less than recreational buyers.
- Cultivation: whether patients may grow plants at home, and how many.
Medical vs. recreational cannabis: benefits of a card
In states with adult-use sales, adults can buy without a card. A card still changes several things, though the details are set state by state.
| Aspect | With a medical card | Recreational |
|---|---|---|
| Taxes | Often lower; some states waive part of the cannabis tax for patients | Full state and local cannabis taxes |
| Purchase and possession limits | Often higher; depends on your state | Set for adult-use buyers |
| Products | Medical dispensaries and, in some states, medical-only products | Adult-use product range |
| Age | Patient age rules set by each program | Adult-use age limit set by the state |
| Physician involvement | A licensed physician reviews your COPD and your medicines | None |
| Document | State card or recommendation, recorded in a confidential registry | Government ID only |
How much can a medical card save you?
It can save money, but only where your state taxes patients less than recreational buyers, and the amount depends on your state’s tax rates and how much you buy. Weigh that against the evaluation fee and any state registration fee. The state-by-state breakdown is in medical vs. recreational cannabis taxes, and the wider differences in medical and recreational cannabis compared.
About medical marijuana programs: where to buy and dispensaries
Qualifying is the first of two steps. In most states a physician’s recommendation is followed by registration with the state health department, which issues the card and enters you in a confidential patient registry; in a few, the recommendation itself is what a dispensary asks for. Purchases happen at state-licensed dispensaries, some of which deliver, and products there are lab-tested and labeled with their THC and CBD content. Delta-8 THC and other hemp-derived products sold in shops sit outside these programs and are tested far less; see what delta-8 is.
Many state laws also let a patient who cannot shop alone, for example someone on oxygen, name a registered caregiver who may buy and handle products on their behalf; who qualifies and how to register is set by each state. Cards from one state are not automatically valid in another; see which states accept out-of-state cards.
Firearms, employment and privacy with a medical card
- Privacy: your medical records are protected under the HIPAA Privacy Rule [22], and state patient registries are confidential; dispensaries and police can usually check only whether a card is valid.
- Firearms: federal law bars anyone who is an “unlawful user” of a controlled substance from having a firearm [23], and cannabis remains federally controlled. The federal gun purchase form, ATF Form 4473, asks this question directly, and a state card does not change the federal answer.
- Work: protections for card holders differ by state, and many employers can still enforce drug-free policies and testing.
- Driving: driving under the influence of THC is illegal in every state, card or not.
Talk to a licensed doctor about COPD and cannabis
A good evaluation is a conversation about one or two specific symptoms, the medicines and inhalers already in use, and what would count as “better.” It goes faster and safer when the facts are on the table, and it can end with a physician saying cannabis is not a good idea for you. That is a useful answer too.
What to bring to the appointment
Tap each item as you get it ready.
Questions worth asking
- Could anything I take now interact with THC or CBD, and what would we watch for?
- If I currently smoke or vape, what does that mean for my lungs, and what are the alternatives?
- THC, CBD or both, and why that choice for this symptom?
- How would we know within a few weeks whether it is helping or hurting?
- Which changes in my breathing mean I should stop right away and call you?
An evaluation makes sense if
- A specific symptom, such as sleep, anxiety or pain, has not settled with the usual steps.
- Your COPD is stable, with no flare-up in the past month.
- Your full medicine list can be reviewed.
- Your state’s program covers COPD or another diagnosis you have.
It is not the right step if
- The hope is to repair the lungs or replace inhalers.
- You are in a flare-up or getting over one.
- Heart failure is not under control.
- You take sedatives or opioids and nobody has reviewed them together.
This page summarizes published research for education. It does not replace a physician’s advice. Cannabis does not treat COPD or repair the lungs, smoke and vapor reach airways that are already damaged, and people taking several medicines face a higher risk of interactions.
How to get a medical marijuana card for COPD online
Everything happens online, so there is no waiting room and nowhere to travel, which matters when a trip across town costs you your breath. Four steps take you from the first form to a card in your hand.
Fill in the intake form
Your state, your diagnoses and your current medicines. Have the record of your COPD diagnosis ready to upload.
See a physician licensed in your state
A one-on-one appointment online. You agree on the time with the physician; keep an hour free rather than a minute.
Receive your signed recommendation
If the physician approves, the signed recommendation arrives in your account.
Register with your state
Where required, you submit the recommendation to the state program, which reviews it and issues the card.
What you end up with
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
A recommendation from a physician licensed where you live and, once your state registers it, a card that lets you buy at licensed dispensaries. Your documents stay in your account, and how the medical card works explains the evaluation in detail. The physicians who see patients are listed on our physicians page.
Programs for veterans and for people with low income are available in some states.
Pricing and what you pay
The evaluation fee for your state is shown before you pay, so there is no surprise at the end. A state registration fee, where your state charges one, is paid to the state separately. Whether a recommendation is issued is the physician’s medical decision, made at the appointment. Details are on how the medical card works.
Renewing your medical marijuana card
Cards expire on a schedule your state sets, and renewal means a repeat evaluation with a new recommendation. It is worth starting before the expiry date so there is no gap. If your COPD has changed since last time, a new stage, oxygen at home, a hospital stay, or new medicines, bring the updated records: the physician reviews your current situation, not last year’s. To renew, choose your state from the list at the top of this page; the steps are the same four as above.
Medically reviewed by licensed physicians
This page is an educational summary of published research, and every study figure carries its source, listed in full at the end. The line under the opening section shows when it was last updated and who reviewed it; the physicians themselves are on our physicians page.
COPD and medical cannabis: FAQ
Can you smoke cannabis with COPD?
Smoking is the form with the clearest harm: smoke carries irritants down airways that are already narrowed, and regular smoking is linked to bronchitis symptoms [10]. Vaping avoids burning but still sends hot aerosol through the same airways. Edibles, tinctures and patches avoid the lungs, yet THC in any form can cause drowsiness and interactions, so the form is a question for your physician.
Is CBD alone safe with COPD medicines?
Not automatically. CBD does not cause a high, but it is processed by the same liver enzymes as many medicines, and none of the COPD studies here tested it with inhalers or steroids. A CBD-only label can still contain some THC. Show the physician the actual product and your full medicine list before trying it.
How long can you live with COPD?
There is no single number. Life expectancy depends on the stage, whether you still smoke, how often flare-ups happen, weight, fitness and conditions such as heart disease. Many people with mild or moderate COPD live for decades. Quitting smoking, pulmonary rehabilitation, vaccines and oxygen when it is needed change the outlook most; cannabis has not been shown to change it.
Can COPD kill you?
It can, usually through severe flare-ups, pneumonia or the strain it puts on the heart, most often in the very severe stage. That is why flare-ups deserve prompt care and why prevention, from vaccines to an action plan, matters so much. Talking openly with your doctor about the outlook at your stage is better than guessing.
What is a COPD flare-up?
A flare-up, or exacerbation, is a stretch of days when breathlessness, cough or phlegm get clearly worse than usual, often after a cold or a bad air day. A rising score on the COPD Assessment Test is an early warning sign [5]. Follow your action plan and call your doctor; get emergency care if you are breathless at rest, confused or turning blue.
What is the ICD-10 code for chronic obstructive pulmonary disease, unspecified?
J44.9. A flare-up is coded J44.1, COPD with a lower respiratory infection J44.0, and emphysema has its own group, J43. The code in your records is one of the things a physician reads when matching your diagnosis to your state’s list of qualifying conditions.
What is chronic obstructive pulmonary disease in Spanish?
Enfermedad pulmonar obstructiva crónica, usually shortened to EPOC. It is the same diagnosis, and records written in Spanish can be used at an evaluation as long as the physician can read the diagnosis and the medicine list.
What about delta-8 THC with COPD?
Delta-8 acts much like regular THC, with the same drowsiness and interaction concerns, and it is mostly sold as vape cartridges and gummies outside state medical programs, where testing is looser. A vape cartridge puts hot aerosol in your airways whatever the label says. See what delta-8 is.
Where can I buy medical cannabis with a card?
At dispensaries licensed by your state’s medical program; some deliver, which helps if getting out is hard. Products there are lab-tested and labeled with their THC and CBD content. Staff can explain products, but they cannot review your medicines the way a physician can. Your state’s rules are on medical marijuana laws by state.
Can I use my card in another state?
Sometimes. Reciprocity, one state honoring another state’s card, exists in some states and not others, and rules for visitors vary. Check which states accept out-of-state cards and traveling with cannabis before a trip, and never fly with it.
What if my card is lost?
Most states let you request a replacement from the program that issued it, and your recommendation stays in your account. The steps are in what to do if your card is lost and the medical card FAQ.
How do I renew my medical card?
Cards expire on a schedule your state sets, and renewal means a repeat evaluation with updated records and a new recommendation. Bring any change in stage, oxygen use or medicines since last time. Choose your state from the list at the top of this page, or read how the medical card works.
How much does it cost, and what if I’m not approved?
The evaluation fee for your state is shown before you pay; a state registration fee, where one exists, is paid to the state separately. Whether a recommendation is issued is the physician’s medical decision, based on your records and your state’s rules. Details for both are on how the medical card works.
Is an online evaluation legitimate?
Yes, where state law allows telemedicine for medical cannabis evaluations. The appointment is with a physician licensed in your state, one-on-one, and the recommendation is the same document an in-person visit would produce. For people with COPD it also means no travel and no crowded waiting room in flu season.
Who finds out? Privacy, firearms and work
Your medical records are protected under the HIPAA Privacy Rule [22], and state patient registries are confidential. Federal law bars anyone who is an “unlawful user” of a controlled substance from having a firearm [23], and a state card does not change that. Workplace protections differ by state; see medical marijuana laws by state.
More research on cannabis and chronic obstructive pulmonary disease
This page cites a selection of studies. Our research library holds every study we track on cannabis and chronic obstructive pulmonary disease, from laboratory work to clinical trials, and lets you filter them by cannabinoid, study type and year.
- studies
- 65
- in people
- 28
- clinical trials
- 4
References
23 sources
- 1. Effects of Dronabinol on Dyspnea and Quality of Life in Patients With COPD. DOI: 10.15326/jcopdf.2023.0401 PMID: 38310543
- 2. Assessment of the mind in chronic obstructive pulmonary disease: Mind or never mind DOI: 10.4103/0970-2113.177462 PMID: 27051096
- 3. Reducing severe breathlessness with dronabinol in the group of patients with severe and very severe chronic obstructive pulmonary disease (BONG): a randomised, double-blinded, placebo-controlled, crossover study in an outpatient clinic in Denmark – a study protocol. DOI: 10.1136/bmjopen-2025-104957 PMID: 41698715
- 4. Beyond Conventional Treatment: Herbal Medicine and Nutraceuticals as Complementary Therapies for COPD and Asthma. DOI: 10.2174/0118743064454037260510201039 PMID: 42582728
- 5. Longitudinal change of COPD assessment test (CAT) in a telehealthcare cohort is associated with exacerbation risk. DOI: 10.2147/COPD.S141646 PMID: 29123387
- 6. Clinical factors associated with smoking cessation among smokers with Chronic Obstructive Pulmonary Disease by sex: Longitudinal analyses from French smoking cessation services. DOI: 10.1016/j.heliyon.2024.e30920 PMID: 38770314
- 7. Expression of endocannabinoid system components in human airway epithelial cells: impact of sex and chronic respiratory disease status. DOI: 10.1183/23120541.00128-2020 PMID: 33344628
- 8. Effects of cannabis oil extract on immune response gene expression in human small airway epithelial cells (HSAEpC): implications for chronic obstructive pulmonary disease (COPD). DOI: 10.1186/s42238-019-0014-9 PMID: 33526116
- 9. Trends in Prevalence and Outcomes of Cannabis Use Among Chronic Obstructive Pulmonary Disease Hospitalizations: A Nationwide Population-Based Study 2005-2014. DOI: 10.1089/can.2020.0133 PMID: 33998884
- 10. Does marijuana pose risks for chronic airflow obstruction? DOI: 10.1513/AnnalsATS.201412-581ED PMID: 25706487
- 11. Chronic Marijuana Use and Chronic Obstructive Pulmonary Disease: A Case Report. DOI: 10.2147/COPD.S520875 PMID: 40655183
- 12. Effect of marijuana smoking on lung function change in older ever tobacco smokers. DOI: 10.1183/13993003.01133-2022 PMID: 36137583
- 13. Chronic use of Datura stramonium cigarettes and late diagnosis of bullous emphysema in a smoker of marijuana and tobacco. DOI: 10.1016/j.rmcr.2022.101761 PMID: 36386287
- 14. Electronic cigarette menthol flavoring is associated with increased inhaled micro and sub-micron particles and worse lung function in combustion cigarette smokers. DOI: 10.1186/s12931-023-02410-9 PMID: 37038183
- 15. Substance Use and Misuse among Adults with Chronic Obstructive Pulmonary Disease in the United States, 2015-2019: Prevalence, Association, and Moderation. DOI: 10.3390/ijerph19010408 PMID: 35010669
- 16. Prognostic impact of chronic obstructive pulmonary disease on short-term and long-term outcomes following coronary artery bypass grafting. DOI: 10.1038/s41598-024-83860-z PMID: 39805902
- 17. Effects of Cigarette Smoking on Oxidative Stress, DNA Damage, Immunological Profile, Viral Susceptibility, and Survival in Patients with Chronic Obstructive Pulmonary Disease. DOI: 10.3390/biom16071009 PMID: 42509802
- 18. Screening Heroin Smokers Attending Community Drug Clinics for Change in Lung Function: A Cohort Study. DOI: 10.1016/j.chest.2019.11.006 PMID: 31759961
- 19. Managing breathlessness in end-stage COPD: a neural respiratory drive approach DOI: 10.36416/1806-3756/e20220264 PMID: 36074411
- 20. Ethics of Health Research Supported by For-Profit Cannabis Companies: What Have We Learned from Big Tobacco? DOI: 10.1513/AnnalsATS.201811-764LE PMID: 30712358
- 21. U.S. Food and Drug Administration. FDA and Cannabis: Research and Drug Approval Process. 2023.
- 22. U.S. Department of Health and Human Services. The HIPAA Privacy Rule. 2024.
- 23. Legal Information Institute, Cornell Law School. 18 U.S. Code § 922: Unlawful acts. 2024.