I quit smoking 5 years ago, and lost more than 70 pounds while doing it.
What helped me was exercise.
Since starting my job overnights, I have slowly gained a nice chunk o'fat back, so I have stopped driving to work and got myself a monthly bus pass--it's like 15 or so blocks from Port Authority to the station, and I can do it at a nice fast clip (with my short out-of-shape legs) in 15 minutes. I hope by summer to do it in half that time.
I urge you to start exercising--replace the cigarette habit with one that requires getting your blood pumping, that makes you do some deep-breathing and requires time to do.
The longer you exercise the more you will notice that your mood, memory and general disposition improves as well.
The longer you smoked, the longer the occasional craving for cigarettes will pop up to bug you--5 years later, the smell of cigarettes makes me nauseus and I can't breathe too well in a smoky room, but when I'm stressed my brain will occasionally scream 'CIGARETTE!' even though I know darn well that if I smoke I'm going to barf.
As the years go by those sudden cravings come farther and farther apart; when you get them, just stop whatever you're doing, and do something else. It's a wierd but effective coping strategy of mine--I'll be reading a book or watching TV or whatever with the family, and suddenly I'll get up without a word, and start doing something else. Now they all know that Mommy's got a craving (either food or cigarettes) so they don't uh, mock me too much for being so flighty. :)
So, give exercise a try, and good luck!
<center>Ron & Fez Class of 2000<br>Old-old-old school crew<br><img src="http://www.ginnysanchez.com/ginsig.jpg"></center>