It's because a smoker, you can be pretty sure, is someone who knows how to say "Fuck it." Oh I'm shortening my precious, precious life on this wondrous planet? Fuck it! They are adherents to not-caring or at least to not-caring-overmuch. Disciples of doing what you want, not what you're supposed to.

They're also practiced at sharing and sharing alike, and the social rituals that go with it. And they know man is powerless - the addiction teaches them that. They become Zen masters by accident (the best way).

The ones who insist on a measure of control, eventually quit.