Moderate consumption of marijuana doesn't adversely affect lung function, according to a study. A study published in 2012 in The Journal of the American Medical Association (JAMA) had some good news for people who smoke marijuana: smoking at a rate of one joint a day for as long as seven years doesn't seem to affect lung function adversely. And then there was the really good news for pot smokers: smoking marijuana in moderation may actually improve lung function, perhaps because inhaling gives the lungs and the chest muscles a bit of a workout.
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