Main concern is that people fully expect issues to be found down the line. Would I bet $100,000 that we won't discover any currently-unknown harmful side effect

Main concern is that people fully expect issues to be found down the line. Would I bet $100,000 that we won't discover any currently-unknown harmful side effects from vaping in the next thirty years? I wouldn't. It's similar to how with each iteration of safer food-grade plastic we end up finding something harmful about it. It's not a good reason to make it illegal, as I think harm should be proven before making something illegal, but I like that people are exercising some skepticism and concern over the unknown unknowns for a new technology, especially one that involves smoking.