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COPD & Marijuana Smoking: Harmful or Beneficial?

Marijuana legalization is sweeping the country these days. Several states enacted legislation in the last Presidential election year to legalize recreational marijuana. I recently moved to a state where both recreational and medicinal marijuana is not only legal; it’s pretty mainstream. In fact, marijuana has a number of common medicinal uses. So, I thought it might be interesting to take a look at whether it could be useful for people who have COPD.

Where Marijuana Is Legal in the U.S.

Only 8 states and the District of Columbia have passed laws legalizing marijuana broadly enough to include recreational uses1. They are:

  • Alaska
  • California
  • Colorado (my home state)
  • Maine
  • Massachusetts
  • Nevada
  • Oregon
  • Washington

A number of other states, though, have broad laws allowing for medicinal use of marijuana1. They include:

  • Arkansas
  • Arizona
  • Connecticut
  • Delaware
  • Florida
  • Illinois
  • Louisiana*
  • Maryland
  • Michigan
  • Montana
  • New Hampshire
  • New Jersey
  • New Mexico
  • New York
  • North Dakota
  • Ohio
  • Pennsylvania
  • Rhode Island
  • Vermont
  • West Virginia

In Louisiana, marijuana can only be used in the form of oils, topical applications or other non-smokeable forms.

Most of the remaining states do allow limited use of medical marijuana. However, this is generally under specific circumstances or only for certain types of illnesses, such as epilepsy or very rare conditions. Even in the states where medical marijuana has been broadly legalized, laws vary greatly. And a few states only allow cannabis-infused products such as oils or pills.

It should also be noted that despite laws at the state level, the Federal government still prohibits any legal use of marijuana for either medicinal or recreational uses. So, physicians can only recommend marijuana but are unable to formally prescribe it as therapy.

Is Marijuana Smoking a Risk for COPD?

Unfortunately, we do not have enough research at this time to make a definite judgment on this. However, we do know that inhalation of combustion products, such as tobacco smoke or wood smoke has definitely been linked to respiratory diseases such as COPD and asthma. In fact, tobacco smoking is the biggest risk factor for COPD. So, it stands to reason that inhaling marijuana smoke might also be harmful.

And, in fact, according to a 2016 report on Marijuana use trends and health effects by the Colorado Department of Public Health & Environment: “The U.S. National Health and Nutrition Examination Survey (NHANES) recently found that daily marijuana users have higher levels of toxic combustion by-products than non-users2.”

This could be because marijuana smokers tend to take deeper inhalations and hold the smoke in their lungs longer than tobacco smokers. And we also know that marijuana smoke contains many of the same toxins that tobacco smoke has. However, marijuana smokers tend to smoke a lot less daily than tobacco smokers do.

No definite links have been made yet as to whether marijuana smoking could cause COPD, as tobacco smoking can. It does seem likely that in people who already have COPD, smoking marijuana is not going to be helpful. Still, there has not been sufficient research done to know for sure the exact risks of marijuana smoking and COPD health.

Could It Be Helpful for COPD Symptoms?

Research done by a Dr. Donald Tashkin, emeritus professor of medicine at the David Geffen School of Medicine at UCLA, over the past 40 years has revealed that smoking marijuana can dilate the airways and ease the bronchoconstriction typical in COPD3. In fact, the same chemical in marijuana (THC) that causes the “high” experienced by marijuana smokers also results in this bronchodilation.

One theory suggests that THC may also have some kind of immunosuppressant effect in the body. Since the hallmark of COPD is airway inflammation caused by an overactive immune system, this seems hopeful. Unfortunately, there is no conclusive evidence along those lines.

Also, unfortunate is the fact that marijuana smoking has been linked to chronic bronchitis, a closely-related condition to COPD2. This would detract from any possible benefits.

What About Marijuana Vaping?

Many people believe that vaping is a healthy alternative to smoking. With vaping (also called vaporizing), the marijuana flower or concentrate is heated in a vaporizing device to a temperature that is below the point of combustion. Therefore, theoretically, the vapor will not contain the toxins that are associated with combustion. This may or may not mean the vaporized marijuana is safe for people who have COPD. The Colorado report referenced above did find that vape-using marijuana smokers did report fewer respiratory symptoms and improved lung function2. But these benefits were not measured scientifically.

You may also wonder if edibles might be an option. Dr. Tashkin does not recommend them, as they often contain a synthetic form of THC that’s been “manipulated to markedly increase the potency3.” And there have been reports of serious complications from edibles, including seizures.

In Summary

We just don’t know enough at this time about the effect of marijuana on lung health, good or bad, especially over the long term. Much more research needs to be done to determine if marijuana is helpful or harmful to people who have COPD. One of the complicating factors in this research is that so many marijuana smokers are also tobacco smokers. So, it’s difficult to sort out the causative risks.

Marijuana has been greatly publicized as having positive benefits in treating other medical issues, such as severe pain. So, if you are thinking of using it for one of those reasons, you will need to discuss the risks vs. the benefits with your health care team before embarking on that path.

This article represents the opinions, thoughts, and experiences of the author; none of this content has been paid for by any advertiser. The team does not recommend or endorse any products or treatments discussed herein. Learn more about how we maintain editorial integrity here.

  1. State Marijuana Laws in 2018 Map. (2018, March 30). Retrieved from
  2. Gershman, K., Contreras, E., Vigil, D. I., Carlson, T., & Van Dyke, M. (n.d.). 2_11 Respiratory Chapter_2017 Update.pdf. Retrieved from
  3. Howley, E. K. (2017, November 24). Is There a Connection Between COPD and Marijuana Smoking? Retrieved from


  • monarchs
    4 weeks ago

    I think theat if its not treated with all of the chimalcals all natural grown withought al the additives it has help a lot of people in reall paine

  • Leon Lebowitz, BA, RRT moderator
    4 weeks ago

    Hi monarchs and thanks for joining in the conversation here. We’re glad you took the time to make a comment. Leon (site moderator)

  • tracebann
    5 months ago

    Is it the same as using a bong or not? What are the advantage and disadvantages of using a vaporizer where smoking marijuana? check this

  • WillDoe
    11 months ago

    I have found pot to be a fall-through. I was less active, sleepier and more prone to justify counter productive activities. It’s just not for me!

  • Leon Lebowitz, BA, RRT moderator
    11 months ago

    Hi WillDoe and thanks so much for providing us with your experiences using ‘pot’. What are some of the ways you are able to make yourself feel better and better manage your condition? Is there anything in that regard that you’d like to share as well? Warm regards, Leon (site moderator)

  • Leon Lebowitz, BA, RRT moderator
    11 months ago

    Hi there again, WillDoe – wow – that’s a great list of ways you’re managing – and, all good ones, too! It has been said that laughter is the ‘best medicine’, so you’re certainly ‘spot on’ with that. Socializing, tuning in (keeping track of conversations and ideas), and pulmonary rehabilitation are all good ways of staying on top of things. Isn’t it wonderful when you realize the hard impact of running can easily be replaced by walking on the right incline?! Kudos to you!
    And of course, quitting those cigarettes clearly has done you a world of good. I’m sure you don’t miss seeing your cardiovascular surgeon one bit!! Having the support and enthusiasm of your medical team is the icing on the cake. Keep up the good work. We’re glad to have you as such a participatory member of our community. Warm regards, Leon (site moderator)

  • WillDoe
    11 months ago

    Hi Leon!
    You wanted to know about ‘…make yourself feel better and better manage your condition?’
    Laughter! Hands down, the best pacifier, balm and analgesic!
    Social activity. Being involved with other people. Keeping track of what has been said and what I have said. (This hasn’t always been the case for me.)
    And, most recently, Pulmonary Rehab. I have degenerative disks, and running on a treadmill was a very painful thing. But WALKING on the treadmill with percentage incline in the grade has helped a lot! I’m much more active and interactive.
    And, of course, quitting smoking. My cardiovascular surgeon doesn’t need to see me for a year! I was on the ‘fast track’ for every 6 months! ALL of the medical people that I see have been very enthusiastic! That’s contagious!

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