I have never smoked but I don’t mind the smell, unless it’s super-stale. I actually find the smell of a lit cigarette kind of pleasant- it reminds me a beloved relative who died when I was a small child, as well as nights out in another country I used to live in, where people smoked a lot. I don’t think I’d care if my therapist smoked- I kind of suspect he smokes pot occasionally, and this doesn’t trouble me either.