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Unlike traditional cigarettes, the nicotine levels in a roll-up can vary anywhere between low and absurdly high

Their risk of heart disease, stroke, and cancer decreases with each passing year

However, some cannabis consumers use alternative consumption methods like water pipes that provide some filtration, as explored in comparisons between bongs and joints

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Flavoring chemicals in e-cigarettes: Diacetyl, 2,3-pentanedione, and acetoin in a sample of 51 products, including fruit-, candy-, cocktail- flavored e-cigarettes

Alicia Zellmer, M.D., and Joy Liu, M.D., are resident physicians in Internal Medicine and members of the ABC News Medical Unit.