So far, since August when I started, I have vaped in:
-Every bar that I've been to (though sometimes discreetly, covering the led)
-The bank (somewhat "accidentally")
-at least 3 grocery stores, usually discreetly in the aisles
-a Wal-Mart
-a Target
-just about any restaurants I've eaten in, though usually in the restrooms.
-a doctor's office, while I was waiting for the doctor
Hardly anyone ever notices. When I'm in bars that I frequent, I am much more open about it than when I'm in other indoor spaces. Usually the worst that will happen is that another patron will ask me about it, and I'll explain that's it's an e-cig, or a "nicotine vaporizer thingie", or something to that effect. Once, I went off on a bit of a tangent about my being from the future, and that "everyone's doing this in 2017", even adding that I had checked with the paradox committee and that they assured me that my talking about it in 2009 wasn't going to endanger my existence in 2017. I'm pretty sure this was met with general amusement, though my memory of this event is a bit fuzzy as I was at this point several beers into my evening.