At work I stealth vape since my livelihood could be on the line, but at a bar I have to agree with Ben. At a bar, what is the worst that could happen, they tell you to go outside. You could try talking to the bartender, and if it's OK with him then you're golden. At the bar I frequent the most, the bartender said I could do it inside, so I do. At other bars that I don't frequent as much, I just start vaping in stealth mode and progressively step it up until I'm producing huge clouds, and I've never been told not to.
The only people who have ever come to me and said "hey, you know you can't smoke in here" have been analog smokers who are just jealous that I'm vaping inside while they have to smoke outside. I explain it to them and they seem interested, so I give them several websites. Do I ever see any of them follow through?.......NO, hardly ever.