Anecdotally, I would like to mention that my partner has been sick for over a month with some kind of lung shit he got from an e-cigarette (vuse something disposable crap). He has been literally unable to sleep through a night for over a month, multiple doctor visits, 3 courses of antibiotics, lung xray that apparently confirmed it was viral pneumonia, but yeah. I have been smoking for over 6 years and still alive, but he smoked that shit for less than a few weeks and he is barely functional. I can't remember the last time I got a full night's sleep anymore, because I constantly have to apply muscle relaxants and ensure he has proper medication to be able to remain asleep.

So yeah, not really the point of your argument, but fuck e-cigarettes, for the rest of time I will have this stance. And yes, I am brutally aware of what cigarettes do as well, but don't knock the "theoretical" effects of e-cigarettes.