Read the OP, and while I'm sure the discussion has moved away from it with over 100 pages of discussion, I'm gonna give my input:
I know a woman who has a kid who vapes. Kid's like 17 now, but started smoking cigs at 14. She grounded him, removed luxuries, random searches of his room, confiscated all sorts of stuff, talked with the school to have him put in "in school suspension", so that he had to do his work alone in a room isolated from his friends, and anything else you can think of. Heck she even had a police officer come over and tear his room apart to scare the life outta him because " if you're hanging out with that crowd who knows what you might be doing " .
It didn't break him. Not even a bit.
Eventually, about a year ago, he picked up vaping, and she gave up the fight. So long as he doesn't do it around her, she doesn't bother anymore. In retaliation to her previous attempts he purposely tanked his grades, refused to do chores, wouldn't talk to her, ect. By time he turned 16/17 she just didn't feel like fighting him anymore just for him to turn 18 and ignore her anyways.
What's worse is he's kinda a cool kid outside of that, but I don't talk with him anymore when I'm hanging out with his mother. Last time he tried to "talk shop" about vaping with me and I told him to <expletive> himself. I'm not about to encourage him and I'm not his mom, I don't need to make nice with him.
However, on the devil's advocate side of things, amongst the minors I have witnessed vaping, I think most of them were likely cig smokers in first place. In that light, while I wouldn't encourage or endorse them, I find it hard to complain too much. They shouldn't be smoking or vaping, but then again there are a lot of things teenagers do that they shouldn't. You can't stop them. That's the way its been forever.
Instead what I think should be focused on is demanding IDs at actual shops and finding a way to verify age online other than clicking a box that says " yes I'm 18+" and using a prepaid credit card.
In terms of vaping bringing people to nicotine that previously wouldn't have considered... well I'm a bad example. I went the first 23 years of my life without smoking or vaping. I grew up in a chain smoking family at that. I hate smoking with a passion. However I took up vaping for several different reasons. However my choice was an informed one based on what I wanted, not a peer pressure or indulgent one. Further my family life has vastly informed my views on substance use, and therefor my logic or thoughts are likely to be outside the mainstream on the issue. Because of that, my choice regarding nicotine is likely not a good example of the average person's thoughts or choices regarding nicotine.
Anyway, done with this WoT since I think I'm getting away from the topic. I don't know how to really keep kids away from them, but I'm not convinced vaping is encouraging kids who would never smoke or vape otherwise to suddenly pick it up either.