I vape everywhere it' not explicitly prohibited or obviously inappropriate, like a funeral home. I've had zero problems. In a restaurant, I may or may not ask first. If I ask, I'll try to ask a manager instead of some server who will go immediately into CYA mode. In a bar, I don't ask. In a theater, I keep my vapor to a minimum so as not to obscure the view of others. In a grocery store I don't ask. In a retail store where I'm going to be spending time, I might or might not vape or I might or might not ask first. It depends on the situation, but I never assume that because smoking is prohibited, vaping is. I'm not smoking and nobody has a legitimate reason to be offended. I don't suffer fools gladly and I don't cater to willfull ignorance or irrationality.
If there are laws against it, they'll be on the state of local level and they'll likely just lump smoking and vaping together. The fight is going on State by State, city by city. CASAA has a lot of info on legislation proposed, passed and defeated that would ban vaping where smoking is not allowed. They have legislative alerts about proposed legislation. Utah was the latest State that went down, AFAIK. Other states dodged the bullet and removed vaping from statewide indoor smoking bans. Some cities have passed anti-vaping laws and some haven't addressed it at all.
My feeliing is that the more you vape in public, the more people will stop confusing vaping and smoking and the more people will realize how stupid these laws are. If you sneak around, vaping in smoking areas, vaping a cigarette look-alike and otherwise acting like a smoker, people will associate vaping and smoking.
I have personally influenced the policies of several bars and restaurants that formerly had no policy on vaping. It is up to us to do this before the anti-nicotine zealots do it for us, either through legislation or their propaganda machine. There's no need to be "in your face" about any of it. But unless the law is already established, we are under no obligation to acquiesce to the demands of every random person who does not know, and is not interested in learning, that vapor is not smoke.
Vape considerately. Demonstrate and educate. That's the only way to immunize the public from the propaganda campaign that's being waged against vaping.