I think the only sensible consistency is to have both, not one or the other. To a smoker, the default is the status quo.

that, and i suspect that many started smoking when they were young, trying to impress their peers, following their parents or friends habits etc, and most importantly not making a conscious decision. "it just happened. i don't know why". you can't regret a decision you didn't make. same goes for alcohol. this is different from drugs where everyone says "don't do it", and so doing it is more likely to be a conscious decision.