If I may get sciency for a moment, there is some research on nicotine and the effects thereof:
Specifically:
Nicotine is well known to have serious systemic side effects in addition to being highly addictive. It adversely affects the heart, reproductive system, lung, kidney etc. Many studies have consistently demonstrated its carcinogenic potential. [Table 1] The only other known use of nicotine has been as an insecticide since 17th century.[4] After World War II, its use has declined owing to the availability of cheaper, more potent pesticides that are less harmful to mammals. The environment Protection Agency of United States has banned use of nicotine as a pesticide from 1st January 2014.[4] India, one of the largest producer and exporter of nicotine sulphate, has progressively banned its use as agricultural pesticide.[5] We undertook this review to evaluate the systemic adverse effects of nicotine.
As far as the “you do you” I really do not have a problem with that, other than the fact that it is almost impossible to achieve. Smokers have cost insane amounts of money to our healthcare system, and while I absolutely agree vaping is less dangerous, it is less dangerous in the same way being shot with a .22 is less dangerous than being shot with a .45. Not being shot is much better, but I guess I would choose the “not shot at all” option. We honestly do not know what the costs of vaping will pan out to be, but I am certain it will be more than none. The other part that I have issues with is marketing to kids. While they may not be obviously doing so, in the same way Zima was not obviously marketing to high school kids, the effect is that kids are getting hooked young. There are no good sides to that.