At present, adolescent smoking has become a social problem that cannot be ignored in China. According to the survey, more than 70% smokers in China started smoking at the age of 15-20. Students can do a careful calculation: suppose you start smoking at the age of 15, and smoke an average of 5 cigarettes a day. According to China, the average life expectancy of citizens is 75 years. A smoker will smoke more than 1009500 cigarettes in his life (nearly 1 10000 cigarettes). Five cigarettes can end the life of a goldfish. If you don't stay away from cigarettes, how much harm will smoking do to your body? The World Health Organization has reported that 90% of lung cancer, 75% of emphysema and 25% of coronary heart disease are all related to smoking or passive smoking, and smoking can shorten people's life by 10- 15 years on average. Many countries in the world have passed legislation to prohibit the sale of cigarettes to minors under the age of 18, otherwise the seller will be fined heavily. Article 15 of China's Law on the Prevention of Juvenile Delinquency clearly stipulates that parents or other guardians of minors and schools should educate minors not to smoke. No business place may sell cigarettes to minors. China's Law on the Protection of Minors and the Code for Middle School Students clearly stipulate that middle school students are prohibited from smoking. This is to care for and care for students from their physical and mental health. 1. Physiologically, middle school students are in adolescence, their body organs and systems are not yet mature, and their resistance to the harm of cigarette smoke is still weak, so they are vulnerable to the harm of cigarette smoke. According to the research, teenagers' addiction to smoking may lead to serious degradation of thinking process and impaired intellectual function, which may lead to serious thinking interruption and memory disorder. Compared with non-smokers, the efficiency of association, memory, imagination, calculation, recognition and intelligence of smokers is reduced by about 10%, and it is difficult to concentrate. Economically, the primary task of middle school students is to study rather than make money. Economically, it depends entirely on the support of parents and does not have the ability to be independent and self-reliant. In the event of "economic crisis", students who smoke often take some illegal measures, such as stealing cigarettes and money from their families or others, or even robbing or extorting money, thus committing illegal acts. Morally speaking, smoking is not only harmful to health, but also pollutes the air and harms the health of people around. It can be said that smoking in public places is very immoral. Smoking is very harmful to the health of developing teenagers, and has a certain degree of influence on bone development, nervous system, respiratory system and reproductive system. Because of the imperfect development, imperfect function and weak resistance of various organs in adolescence, the harm of smoking is even greater than that of adults. In addition, because the respiratory tract of teenagers is narrower than that of adults, and the cilia of respiratory mucosa are underdeveloped, smoking will damage the respiratory tract and produce inflammation, increase the resistance of breathing, reduce vital capacity, and affect the development of teenagers' thorax, thus affecting their all-round development. A large amount of nicotine contained in tobacco is also toxic to the brain, which will reduce students' memory, listlessness and academic performance. The above-mentioned experts' research, investigation and appeal on the health hazards of smoking to teenagers are not sensational. A story about 16-year-old boy suffering from cancer due to smoking is a profound example: 1998, the Department of Thoracic Surgery and Anesthesiology of Cancer Hospital of China Academy of Medical Sciences joined hands to take out the tumor for a boy in time and successfully reconstruct the carina. The carina is the "communicating artery" where the trachea and the left and right bronchi breathe, and it must be kept unobstructed. Bi Mou, a middle school student aged 0/6 in a city in the south, has a tumor on the carina. Half a year ago, he developed symptoms, but unfortunately he was misdiagnosed by the local hospital and has been treated as a cold. After careful examination, the doctors of thoracic surgery and anesthesiology in Cancer Hospital of China Academy of Medical Sciences found that the tumor had blocked the patient's left bronchus, leaving only a small gap in the right bronchus. The operation is very difficult, especially anesthesia to ensure the safety of the operation. Although the cancer hospital has done dozens of medical breast augmentation operations and has a lot of experience in anesthesia for such operations, after all, the patients are young, the tumor is large, the condition is serious and the operation risk is high. If the operation is not done in time, the child will soon suffocate. Doctors' well-designed treatment scheme and skilled medical technology have given teenagers a new life. How can a young middle school student get such a fatal disease? It turns out that he is a smoker and has been smoking for more than two years, from stealing to smoking in public until he needs to smoke three cigarettes a month. According to oncologists, when smoking, most smoke enters the lungs through trachea and bronchus, and a small part enters the digestive tract with saliva. Some harmful substances in smoke remain in the lungs, and some enter the blood circulation and flow to the whole body. Under the synergistic effect of carcinogens and cancer promoters, normal cells are damaged and become cancer cells. The younger you are, the more sensitive human cells are to carcinogens, and the greater the harm of smoking. The reason why this teenager suffers from cancer is the synergistic effect of his premature, excessive smoking and other cancer-promoting factors. Now, he not only says that he will never smoke again, but also intends to persuade his classmates and friends to give up smoking as soon as possible.