I read a bit about that, and now that tocopherol is no longer used as an additive, the only questions seem to be 1) if flavorings are not turned into bad things

I read a bit about that, and now that tocopherol is no longer used as an additive, the only questions seem to be 1) if flavorings are not turned into bad things by the vaporization process 2) if nicotine has enough negative side effects when inhaled to warrant restricting what's an efficient and self-directed smoking cessation method. About 1) the solution for the FDA has been to ban flavorings, under the "think about the children" idea. While the risk of childen getting addicted to nicotine could be a concern, given the lack of measured risk, it could be as innocent as enjoying beer. About 2), nicotine seem to have negative effects on arteries and the skin mostly, causing premature aging (increase elastases and metalloproteases). We may have more data in a generation or two, but it would be advisable to plan on reducing your use of e-cigs.