Nobody really knows: It is reasonable to assume that e-cigs will prove to be safer than combustible tobacco smoking, but the reality is that, at this point, there is little or no data. The smoke clearly contains less in the way of cancer-causing tars, but nobody really knows what the other ingredients - propylene glycol, oils, flavorings, additives etc- even are, let alone what they do in the long and short-term.
Answered 6/28/2014
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