Cigarettes contain a lot of nicotine, which is a harmful substance that can cause great stimulation to the gastric mucosa. During the smoking process, smoke is also inhaled into the stomach, and the gastric mucosa will be stimulated, resulting in bleeding and lack of oxygen in the gastric mucosa, which can lead to gastric ulceration or erosive gastritis over time. Often smoking is very harmful to human organs, the digestive system, respiratory system, the circulatory system will be affected, smoking will also make the teeth black, yellow, leading to bad breath and other oral diseases, smoking is also easy to get old, the nicotine in cigarettes can destroy vitamin C, so that the skin loses its smooth elasticity to increase wrinkles, smoking is more harmful to the lungs, smoke will turn the lungs into black, in order to reduce the occurrence of stomach diseases It is best to quit smoking, especially those who suffer from stomach diseases, smoking can affect the recovery of the disease.