According to an independent study it contain cancer causing agents.
http://www.thedailybeast.com/articles/2015/09/05/the-poison-in-your-e-cigarettes.html
http://www.ecigarette-research.org/research/index.php/whats-new/whatsnew-2015/225-ceh
OP, buy yourself a nice mod like the Subox Mini. 60 bucks for all you need to start except juice. Most of the people above that didn't like vaping probably had some cheap gear. There will be a detox period from the nasty stuff in cigs, but after that you should feel much better
Healthwise we don't have long term info on the effects. However, it's hard to be worse than cigarettes.
Use low nic juice or make it a point to go outside and increasing addiction won't be much of an issue.