I have no clue: go to a store that sells electronic cigarettes and see. I am not a fan of these, although some of my colleagues think they are a healthier alternative to cigarettes. The problem is that, even without nicotine, there are unknown elements in the vapor (propylene glycol, additives, flavorings, colorings, preservatives) that have not been studied for effects when inhaled chronically.
Answered 7/29/2014
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