Well done on quitting. I put on about 5kg when I quit smoking because instead of smoking between classes (I was teaching English at the time) I was shoving crackers and all kind of snacks into my mouth.
However, I'd take those 5kg over smoking anyday!!! They say it's normal to put on a few kgs after quitting because you do tend to substitute the cigs for food, and as your taste and smell senses return, you enjoy food so much more. But they also say that it starts to come off naturally once you get a bit more mobile and get over the cravings etc.
All the best
Just keep moving! And don't be lazy...
SW: 74.3kg - 1/1/09
CW: 71.1kg - 3/5/09