Exactly! You and i do not know. It's always proper to err on the side of caution and respect...not vape and wait for someone to take issue with it as most people are non confrontational and wouldn't raise issue even though it offenders them. They will just leave and never return...perhaps.
If a person has a problem with anything I do, whether it be vaping, the perfume I have on, or the way I choose to let my children behave, and they are too bashful to say anything it remains their problem. If they have not approached me they have not given me opportunity to choose my next action. I may say "Oh, Im sorry, I will respect you because you respected me and stop action". Or I may tell them to take a hike if what I was doing had nothing to do with them, but if they choose not to say anything I am not aware there is any problem and have to believe there is not or not bothersome enough to be asked to stop. Look, I am one of a large Deaf/HoH family. We sign and we are loud. We do not do it to be obnoxious, but rather so we can hear and communicate with each other. I have been approached by some asking if we can quiet down and I always apologize ( not cause it is wrong, but because I hate to bother others and am polite for most part) and explain. Most change their position and if vape was replaced with loudness and I was given the chance to briefly explain I feel most would also change their position. At the very least I would know that I was upsetting somebody else and then be able to choose my reaction same as I could choose to try to keep my families volume down by the ones that hear better monitoring it or keep on enjoying ourselves as we need to as is our right.