A therapist´s health is of no concern to me. As long as their office doesn’t reek of cigarette smoke, I couldn’t care less. I wouldn’t see it as being human or as a moral failure on the therapist’s part since I don’t look up to them.
If it has no impact on my life, I don’t care.

On the other hand I hate people who smoke at cafés (it used to be the case in restaurants, bars and clubs as well) because I get the smell of cigarettes in my face/in my food. Ugh.
I wouldn’t date a smoker for instance, it’d be a deal-breaker for me.