I take my vape out occasionally. If i'm going out flying (fpv drones) for the day i'll usually carry it or if i'm out walking for the day, similar. Would I use it in the city, don't know, probably not. I'd hit the vape before hand, but I don't go out much anyway so it's fine. I usually drive, so don't use it for obvious reasons, but if i'm on foot, it's definitely coming with me.
I'd love to use it in a library and I do think wandering around the Natural History Museum in London would be a pretty fun thing to do while vaping something mellow. But museums have always been favourites while super stoned or at least in the past I have spent many an hour wandering around them in such states. Also the main library in the city had a kids area with bean bags and was super chilled out, so i'd smoke a blunt and just crash in there on a bean bag and read a book when I was in my teens. Good times. But nowadays and being much older, it's a lot harder I think. Much easier to get away with such behaviour when you are younger.