E-cigs have been around a lot longer than you think they have been around since the 60's actually. So 60 years of studies isn’t a long enough time for you. Yes they have only gained mass popularity in the last 10 years but they have been doing studys since they were first invented.

Actually the technology for e-cigarettes has been around for 60 years. Its only in the last 10 that it has become popular. If 60 years of studies isn’t enough for you to believe them when they say they are relatively safe.. I mean they are as safe as alcohol.