In fact you cannot find any evidence that nicotine, delivered by itself and without
tobacco, causes any dependence at all, no matter how you define dependence or addiction. There are millions of never smoking vapers now, but no reports of dependence at all.
I think the issue is, not so much is nicotine addictive, as it is, is nicotine on its own, harmful. From what I have found, it is no more harmful than caffeine in a cup of coffee. Also, there may be millions of new vapers that never smoked, but I suspect they are using 0mg ejuice, for the social and competitive aspects (like chewing gum, hanging out at the store drinking cola, and vape tricks and cloud chasing). The only difference is, now new vapers can participate, where as before you couldn't hang with a group of your smoking friends. Historically speaking, chances are that if these new vapers didn't start
vaping, they would have started something else. Either smoking tobacco or herbs, or drinking, or something involving a plastic bag and battery cables. LOL. There is always something to try, and always somebody to try it. The bigger focus, should be on cigarette smokers coming off tobacco and non-smokers never starting tobacco. Meaning, the decrease in number of new smokers every year vs the increase in new vapers every year.
Personally speaking, I dont HAVE to HAVE a vape every 20 minutes. I don't sit on my computer and chain vape from my RDA, where as before, I would smoke 20 cigarettes a night while playing Warcraft. Now I don't.