Yeah I mean the way said friend knew that the therapist smoked was that he could smell it. She didn't say anything about it and he certainly didn't see her smoking. Whether someone smokes with any regularity is usually very evident to a non-smoker because of how they smell. After a certain age, you can often hear it in their voice, too.

So for me, thinking less of someone is kind of judgy which i admit is unfair—we're all human, it's a powerful addiction, I used to smoke, smoking is a proxy for social class etc. yes I know— but also I find the smell makes me feel unwell, gives me a headache, makes my eyes itch. So the office would likely feel unwelcoming to me.