I used to smoke quite heavily, but I never had any withdrawals. When I feel like stopping for any reason I just stop. Right now I'm in an appartment where I can't smoke and I had no problems just not doing so when I moved in here.

Smoking in general is more of a social/meditative kind of thing for me though, especially the process of rolling a cigarette.

My attention also snowballs into just about anything and everything else just disappears from existence during that time, so perhaps I just don't notice any withdrawals by focusing my attention on other things. Heck, I forget to eat on some days, and I absolutely love food.