I just quit smoking too - five months w/o a single cig after 17 years. But, what are the facts about weight gain after quitting. I thought that it was just a simple thing...I'm not smoking therefore I'm putting something else in my mouth, i.e. food. But now, I've heard, that it's actually a metabolic change to which the 'quit smoking weight gain' is attributable. What's up? I couldn't figure out why I was doing Atkins rather strictly and feeling like I was balooning - any ideas?