“I think you nailed it; just like pot use and tolerance has “evolved”.”
e-cig concern is also cannabis-related. You can get pot-extract in e-cig juice that is very concentrated, with no way to tell if a person is vaping nicotine or THC, apart from giggling.
Wow, the things I’m unaware of living my sheltered life!
And in the minds of fanatics, that's reason enough to ban the former.