Since I hear lot of people, especially us ladies, are worried about putting on weight when quitting, I would like to say that this is not the case for everyone.
I've been quit 8 weeks now and lost 1kg so far. Ok, not a huge weight loss there but not a gain either. I'm not on diet and I don't exercise like crazy either, but kept on going like before. I think the reason for the loss has been less wine & more energy. I use to love 1-2 glasses of red wine with dinner, but since it gave me such bad cravings, I've drank less during the week and chosen white instead of red more often (less calories & association with cigs). I have also had more energy to do stuff at the house & garden, so using more calories because not sitting by the TV as much.
So for those still considering... you can make a huge change in your life by quitting smoking and with couple tinytiny changes keep your weight as is or even loose some