Smoking is not recommended immediately after a gastroenteroscopy. As patients will have different degrees of gastrointestinal reactions during gastroenteroscopy, smoking immediately will lead to increased secretion of gastric juices and aggravate the patient’s gastrointestinal discomfort. Gastroenteroscopy may cause local mucous membrane irritation, such as stimulation of the mucous membrane of the pharynx, foreign body sensation in the throat or edema, etc. Cigarettes contain nicotine, tar and other harmful ingredients, which may cause patients to experience nausea, vomiting, stomach pain and other discomforts due to the stimulation of smoke during smoking, which will have a certain impact on the recovery of the organism after the gastroenteroscopy. It is recommended that patients try to eat fluids or semi-fluids after the examination. Smoking is not conducive to the recovery of gastric diseases, and patients try not to smoke in order to avoid the occurrence of uncomfortable symptoms.