Aside from my one and only convert (my boyfriend), I have seen one person.
At my last job, she was vaping outside in the smoker's section. It was a mini of some kind, maybe a disposable. Not sure. It was at least the length of a 100, an automatic, and looked exactly like a cigarette.
Coworker at that job also used to vape as well. Never saw her do it though.
And funny that, I met my boyfriend at that last job, and he was still working there when I converted him!
Other than that, not a soul, though I would love to stumble across some stranger "in the wild."