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There is “absolutely no comparison” between the safety of marijuana and tobacco smoke, Dr. Tashkin added, noting that the latter is the top cause of preventable deaths in the United States. No one has ever overdosed on marijuana, and no major studies have found a significant increase in lung cancer risk from the drug.

A Swedish study of 45,450 males showed no increase in the 15-year mortality rate of pot smokers, compared to those who did not smoke, according to an editorial published in BMJ.