In a study released by the University of California, San Francisco and published in the Journal of the American Medical Association, researchers found that marijuana users did not suffer any detrimental effects to lung capacity with occasional use. This is contradictory to the established notion that any smoke is going to have a negative impact.
The study notes that more frequent use does have a negative impact and made a somewhat dubious claim that smoking 20 joints a month is considered a lot and would be unusual. Anecdotal evidence suggests this amount is not as unusual as the study authors might believe based on what those surveyed reported. Continue reading