Smoking anything, including marijuana, is never a good idea for people with lung disease. But, marijuana in other forms may benefit people with COPD.

No conclusive research indicates that marijuana can treat COPD. Certain factors make performing clinical studies with marijuana difficult. The strength of marijuana can vary greatly, depending on the variety, for example.

Also, research has shown that many people who smoke marijuana also smoke cigarettes, which can make it difficult to isolate the effects of marijuana.

However, some research indicates that marijuana use may increase forced vital capacity (FVC).

FVC is the amount of air that a person can forcefully and quickly exhale after taking a deep breath. Reduced FVC is one sign of COPD.

According to a 2015 reviewTrusted Source of 19 studies, smoking marijuana may increase FVC, though the reasons remain somewhat unclear.

Some researchers have suggested that CBD and THC may decrease swelling in the lungs and help to open the airways in people with COPD.

It is important to understand that many medications and other treatments for COPD exist and that these do not involve marijuana.

Treatment for COPD often involves bronchodilators and steroids that the U.S. Food and Drug Administration (FDA) have studied and approved. The FDA have not approved marijuana to treat COPD.


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