Another data point:

I'm some kind of introvert, if i hang out with people, my social "battery" drains and i get tired. I smoke because it gives me much more time before my social "battery" is empty. I don't smoke otherwise.

Right now i'm at two packs a year.

That sounds like a lot to me, almost once a week. Then again it's normal to drink that often without being considered an alcoholic.

A person would usually smoke more than one cigarette at an outing, so its more acute than chronic, I'd assume. Not sure what impact that would have in terms of health differences, but in terms of addiction potential it definitely would.