The issue with physical addictiveness is it slants the situation towards continuing to use something not being a reflection of the ordinary like or dislike of a product. Without nicotine, there's a good chance that a 13 year vaper will be bored with it by 16. If we could really keep them away from nicotine until 18, starting young would reduce long-term nic addictions. However, vaping nicotine is less addictive. Smoking cigarettes is the most addictive: not only is there real tobacco and possible additives (I think it's mainly the tobacco, actually), but a single cigarette contains so much of it that most beginning smokers have to work at it to build up a tolerance. When someone has a choice of nicotine levels, they usually gravitate towards a much lower level.
My main problem with kids doing "adult" things is actually "what's the hurry?" We may a have big problem these days anyway, with constant electronic stimulation, in a lack of the painful but essential role of boredom in the development of young imaginations.
I have to bring up the subject of caffiene in this thread. I know I spoke against "pointing fingers" tactics yesterday and it's not my intent to shift blame or suggest rules. However, I do think it is the one thing that is extremely comparable to nicotine except for the issue of smoke. In the case of consuming caffiene in highly sweetened drinks, it may be comparable to vaping or worse. Caffiene is extremely addictive. I have been addicted to it since the age of about 11 and as close to a driver or gateway as can be to every other intoxicant I have ever consumed. I go into a store that sells 10 kinds of soda, 9 contain caffiene and the other flavor is sold out. You'd think if they keep selling out, they'd start ordering more, maybe even realize noncaffienated is what people want. But, the makers and vendors apparently realize the addictiveness keeps selling product.