It's very important to quit smoking, even if you gain a few pounds. The good news is that the average weight gain after quitting is less than 10 pounds. And even if you do gain a few pounds, that's not as important as saving your life — and the lives of others. When people gain weight, it's usually because they start to eat more once they quit smoking. If you watch what you eat and stay physically active, you may not gain at all! © AHA