The effects of smoking on the body are caused by respiratory diseases, cardiovascular and cerebrovascular diseases, digestive diseases, addiction and so on. 1. Respiratory diseases: long-term smoking makes the respiratory mucosa chronic inflammation, serious congestion, edema, inflammatory secretion oozing out, and even cause changes in the structure of the respiratory mucosa, the oral cavity, trachea, lungs have damage, resulting in chronic bronchitis, emphysema, lung cancer. 2. Cardiovascular diseases: long-term smoking easily causes coronary artery vasoconstriction, and harmful substances make coronary artery vasoconstriction, which is an important causative factor of myocardial infarction; it can also increase the secretion of adrenaline, which can cause heartbeat to accelerate. 3. Digestive system diseases: long-term smoking can easily cause gastric acid secretion disorders, increase the acid load in the duodenum, which can easily cause gastritis, gastric ulcers, etc., and reduce the lower esophageal sphincter tone, induce reflux esophagitis, etc., and also increase the risk of gastric cancer. 4. Addiction: Because cigarettes contain nicotine and other alkaloids, long-term smoking makes people addicted. Smoking is harmful to health, for the sake of your and your family’s health, you should quit smoking as soon as possible. The success rate of quitting smoking is relatively high when it is done in a scientific way under the guidance of a doctor.