Being at a fairly sizable public university, I see all kinds of people. And that includes vapers. I see someone taking a vape every so often, and there's a vape shop at the local mall. The people I see in there when I walk past it could best be described as "exactly the sort of person you'd expect in a vape shop at a mall in a Midwest college town".
And then, there was the time when I was sitting in a public area, working on my laptop while I waited to go to class. A few yards away, there was a dude with an e-cigarette blowing out huge clouds of vapor. This was inside a building, to be clear. I mean, even if there's nothing harmful in it (which I am not at all confident is true), that's still weird.