After quitting smoking, you will feel hungrier and your body's ability to absorb food will improve. Almost all smokers have a big appetite after quitting smoking. In order to avoid gaining weight, you can do some physical exercise and eat some low-sugar and low-calorie foods. I am a smoker, too. I haven't given up smoking yet. Everyone knows that smoking is harmful to health. Now that you have started to quit smoking, stick to it and quit smoking scientifically. I wish you success.