I always ask. So far i've vaped at the nail salon, & on the outside deck at Bubba Gumps Seafood at the Kemah Boardwalk, in Garden Ridge Pottery, & that's all. My 80 yo mother lives with me & stiill insists that it's smoking. She told the people at the salin that I was smoking & they looked at her like she was nuts! And I had already asked! At the restaurant, I just started to vape without asking since we were outside, & she told the waitress I was smoking, I held up my set up, & the waitress (maybe 20 yo), laughed & said "oh, she's not smoking, she's vaping. That's ok. In fact you can vape inside, too!". But I usually ask first, & try to use a fairly orderless juice when out like that. Some have a really strong aroma, like Castle Long Reserve. That may not be what others want to smell, even if it doesn't smell like cigs. I just try to be considerate. But I never try to hide it.