This article at first which I thought was just bs cites a key finding from Dr Farsalinos whom many people funded through the crowd funding site to perform tests on ecigs and eliquids. Basically the key finding is that even high powered advanced devices give off negligible amounts of nicotine and nowhere near the amount you would get from a traditional cig. So in other words they say that all this smoking cessation is just placebo. Check it out:
http://kronstantinople.blogspot.com/2014/03/the-great-white-hoax-e-cigarettes-are.html
http://kronstantinople.blogspot.com/2014/03/the-great-white-hoax-e-cigarettes-are.html