Smoking is harmful to the stomach, and may lead to excessive secretion of gastric acid, induce reflux esophagitis, gastric mucosal lesions and so on. 1. Excessive secretion of gastric acid: Cigarettes contain more harmful substances, which may cause damage to the gastric mucosa and may lead to excessive secretion of gastric acid. 2. Inducing reflux esophagitis: for people who smoke a lot for a long time, it may affect the cardia sphincter, leading to relaxation of the sphincter at the cardia, thus inducing reflux esophagitis. 3. Gastric mucosal lesions: the harmful substances contained in cigarettes are relatively large, which may lead to contraction and spasm of the capillaries in the stomach, resulting in a decrease in the protective capacity of the gastric mucosa, thus increasing the chances of gastric mucosal lesions. Smoking not only affects the stomach, but also other organs of the body. Therefore, for long-term smokers, it is recommended to quit smoking as soon as possible.