I wish you could just buy single cigarettes rather than always getting a pack. I feel that's a big part of the problem right there.

It would be like only being able to buy wine in boxes of 20, or beers in crates of 30. Once you have it, you're much more likely to use it. I just want a beer or a bottle of wine this Friday evening, and maybe after that I want a cigarette. And that's it.