I've never seen a vape shop get clouded out like you're referring to.
I was at a vape meet where it got a little foggy, but that was in a small room during a sub-ohm coil building seminar. Get a few dozen of those going at the same time and you can see it.
A vape convention huh? I'm gonna guess that somewhere over 50% of the attendees were huffing and puffing and showing off. Probably an extreme example isn't it? Besides, if there were that many people vaping, who'd be left to complain?
So, yeah, I'm guessing the part of the library that houses the physics and electronics books could become obnoxious.