Nobody knows: There have been no studies of even short-term use, and nobody knows what is in the oils and their flavorings and what they do. Oil in general ain't great for lungs, and the vehicle used in these vaporizers is propylene glycol, and nobody knows what his does when inhaled either. While it is likely that vaping will not be as bad as smoking tobacco, nobody can say that yet with certainty.
Answered 10/28/2017
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