I mean, this is clearly a bit, but I don't think addicts smoke exactly one cigarette a day. Some people who smoke small amounts never become addicted. I used to smoke, like, half a pack over a few weeks, forget where I left it, and then go months without smoking. Haven't smoked at all in probably eight years now, not because I intentionally quit but just because I couldn't be assed to carry them around any more. (I really only started buying cigs so that I could stop telling people I didn't smoke when they asked to bum one.)