Gaining weight after quitting smoking may be related to the withdrawal reaction, increased appetite, improved digestion and other reasons. 1. Withdrawal reaction: after quitting smoking, there may be withdrawal reaction, including panic, inattention, irritability, etc. In order to eliminate the effects of withdrawal reaction, some people will eat snacks, high melon seeds and other food to divert attention, eat more food intake of excessive calories, easy to gain weight. 2. Increased appetite: cigarette smoke tar, nicotine and other ingredients will play a role in appetite suppression, after quitting smoking appetite is no longer inhibited, will increase the appetite to eat more things every day, time is naturally easy to get fat. 3. Improvement of digestive function: cigarettes contain nicotine, hydrocyanic acid and other ingredients will also inhibit the body’s basic metabolism, affecting the gastrointestinal tract digestion, absorption function, after quitting smoking, the body no longer absorbs the ingredients in the cigarette, the digestive function can be improved, easier digestion and absorption of food, more prone to obesity. If you gain weight after quitting smoking, you can slowly stop your body from gaining weight through dietary management and increased exercise.