Just remembered a few specifics.
Bars: If they allow smoking, I vape. If not, I still tend to until asked not to…occasionally, I'll ask first. I've been asked not to exactly once, but they knew exactly what
vaping was. It was a fairly large place, and they didn't want all their employees to have to worry about whether it was a cigarette or a vape. Other than that, the only times it's come up were when people wanted to see my device. FWIW, the Twist got the most interest from non-vapers…Provari from vapers.
Clubs: Absolutely. At worst, they'll think it's a drug…which they mostly allow or at least ignore. No one's said anything.
Restaurants: Not unless they allow smoking, which is all but unheard of now. I think it's just a respect thing.
Planes: I'm told it's banned in the US.
Cruise Ships: They said not to except where they allow smoking because they didn't want to cause a panic. Makes sense. Mostly, I did it anyway. People were into their own thing and not paying attention to me. But, I also tended to gravitate either outside or places they allowed smoking anyway.
Malls: Yes. They often have crappy kiosks selling overpriced junk, and I feel like I could potentially save someone from spending ten times what they should on a 510 or eGo setup if they ask about what I'm
vaping and why the clouds are so much bigger. But not in the actual stores or the food court.
Individual Stores: it really depends on how much time I'm spending in there and how much I care about potentially being kicked out. I've never been asked to stop or even approached the few times I have. I think this is the only place I even think about stealth vaping.
Concerts: Yes, as long as it's not formal. The most I've had to do was scream at the bouncer/security that it wasn't a cigarette and presents no more hazard than the smoke machines…they generally seem to decide it's not worth their time to argue with me and go about their business trying to keep kids from dying of alcohol poisoning.
Formal Concerts (think opera, ballet, etc.): Only during intermission, and only in smoking areas. Same goes for plays, movies, etc..
Street: Always. Never had a problem.
Driving: Always. Had people ask for a hit who were disappointed when I said it was an e-cig.