Many people like smoking, especially the elderly. They will smoke a cigarette after a meal, and even say: A cigarette after a meal is better than a living fairy. But they don't know the harm of smoking to human body. A person who smokes/kloc-0.5 to 20 cigarettes a day is prone to lung cancer, oral cancer or laryngeal cancer, and the mortality rate is/kloc-0.4 times higher than that of non-smokers. The risk of dying from esophageal cancer is four times higher than that of non-smokers. The risk of dying from bladder cancer is twice as high; The risk of dying of heart disease is twice as high. Smoking is the main cause of chronic bronchitis and emphysema, and chronic lung disease itself will increase the risk of pneumonia and heart disease, and smoking will also increase the risk of hypertension. The harm of various organs. The harm of smoking is well known. As many as 2.5 million people die from smoking every year in the world, and smoking is the first killer of mankind. Consciously developing the personal hygiene habit of not smoking is not only beneficial to health, but also the embodiment of noble public health ethics. In the smoking room, especially in the environment with closed doors and windows in winter, the room is not only filled with carbon dioxide exhaled by human body, but also with carbon monoxide exhaled by smokers, which will make people feel headache, burnout and work efficiency decline. More seriously, the contents of tar and nicotine in the cold smoke exhaled by smokers are 1 times higher than those in the hot smoke inhaled by smokers, and benzopyrene is 2 times higher, carbon monoxide is 4 times higher and ammonia is 50 times higher. Smoking is so harmful, why do they smoke? Teacher's comment: This article focuses on the harm of smoking to human body. The second paragraph is the core of the article. The author enumerates the dangers of smoking by enumerating figures, comparing and giving examples. I hope the little author can add some real experiences and explain his dislike of smoking with his own experiences and feelings. I hope everyone will take action, refuse smoking, care for life and pay attention to health.