well that's all well and good if the smoker is a person who can be reasonable, a neighbour of mine told me recently that a man cut in front of her in the queue for the cashpoint and after politely pointing it out to him he became very abusive and threatened her, not only that but not one person in the queue came to her aid or at least supported her so no, I would not mention it to the smoker because you don't know what kind of person you are talking to or what might happen if you do say something.