Re: Vaping is harmless
Lack of evidence isn't the same thing as evidence. What studies have been done; what were the methodologies; have they been peer reviewed? No studies HAD shown that lead in petrol or cigarette smoke or CFCs were harmful... until all of a sudden lots of studies showed that those things were all harmful!
On the other hand, I strongly suspect that there isn't any harmful effect of second hand vaping too - I've just got no evidence to back that up!