E-cigs didn't destroy the kid's market for traditional cigarettes, though. When I was in high school (right before vaping took off), smoking was only "cool" for a small subsection of the school. For everyone else, it was a stupid thing and kinda trashy. I'm guessing that the set of high school aged kids who would have picked up cigarette smoking if not for vaping is really quite small.
So, we worked for decades to eliminate cigarette dependency, made huge progress, and now kids largely don't smoke. And then vaping came along, and a company is receiving billions from investors to get kids addicted to nicotine.
Vaping is healthier, but I can't think of a conceivable reason why this is a good idea.