I'm sure that last applies to people who are regular smokers. I wouldn't be so certain about occasional users, like the husband mentioned up the thread who only smokes at folk festivals.

For some people, of course, occasional smoking isn't possible, the same way that for some people occasional drinking isn't possible. But it just doesn't work that way with everyone. Which isn't a matter of strength of will or anything, I'm certain, it's just that bodies work differently.

(And no, I don't smoke, and dislike being in a room where people are smoking cigarettes.)