I used to work with a chain smoker and the first thing he would do when checking into a non-smoking hotel is call the front desk and complain that his room smells like smoke from the previous customer, but refuse to change rooms. Then he smoked continuously during his stay.

In Japan hotels still have smoking rooms, and when I was working there I would get stuck in one about 10% of the time. I would wake up with dry eyes and throat, and a hangover-like headache.