Interestingly, at the same time this relentless fear-porn negative coverage about e-cigs is being bandied about (among other things like "vape juice is worse than cigarettes!"), millions of people are saving their own lives by switching to electronic cigarettes. The big tobacco companies do not like this one bit. Nor do governments who see billions of dollars every year in cigarette tax, nor does big Pharma, who generate massive sums off the "management" of cancer victims and others. This is why we only see a negative narrative with regards to the phenomenon.
One has only to examine the sources of the many studies for and against E-cigs to see that the negative ones - while not completely irrelevant - are largely funded by big tobacco in collusion with governments.
Even more interesting, companies like Philip Morris are developing their own proprietary vape technology even as they spend obscene amounts of money trying to convince us E-cigs are evil. It works by vaporizing actual tobacco in a traditional cigarette form factor, ensuring a transition to smokeless cigarettes while still maintaining the high prices and exclusive government approval for public sale.
As always, follow the money - not the hype.