I stopped smoking three months ago. I too was worried about gaining weight because i was up to 194 . It smoked about half a pack a day...not a lot ...but I have asthma and problems with bronchitis so it goes without saying...i needed to quit! I read online that smoking can burn an average of 200-300 calories a day.That was quite depressing to me but i had to do it. I also stopped drinking around that same time. I probably drank about three times a week anywhere from two drinks to five. I had horrible cravings for cigarettes the first month. Every time i got in the car,every time i was in the supermarket. I came so close to giving in,somehow i pulled through and have made three months. I think about it less and less. The best thing is I have lost ten pounds. I walk 3-4 times a week and follow the SPI. It is possible to quit smoking and lose weight. Get healthy first and foremost and let the weight loss be a great side effect!