Due to individual differences in each person, the time needed to recover from gastrointestinal dysfunction after quitting smoking varies. It is recommended to go to the hospital for examination and treatment under the guidance of a doctor if necessary. In general, people who are in good health and do not have organic lesions in the gastrointestinal tract can recover from gastrointestinal disorders caused by quitting smoking in about a month. If there are lesions in the gastrointestinal tract (e.g., gastric ulcer, gastroenteritis, etc.), the recovery time needs to be relatively longer. During the period of quitting smoking, people may experience symptoms such as fatigue, irritability, loss of appetite and other discomforts, which are normal phenomena and do not need to worry too much. During this period, people can do appropriate exercise or do something they are interested in to distract their attention. Dietary attention should be paid to the consumption of light and easy to digest food, intake of vegetables, fruits, meat and other food rich in nutrients. If necessary, medicines to protect gastric mucosa (such as omeprazole, etc.) and medicines to regulate intestinal flora (such as Lactobacillus acidophilus, etc.) can be taken according to medical advice. After adjustment, the function of gastrointestinal tract will gradually recover.