In San Francisco almost every place is smoke-unfriendly. We have a patio and a roofdeck and we're not allowed to smoke in either place. I tend to smoke in my bathroom (there's a fan/vent, and I also have 1-2 fans going at the same time), but the walls have definite tobacco stains. I actually didn't notice until I looked in the 2nd bathroom and saw that the shower was sparkling white.