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 survey found that the academic performance of smokers was lower than that of non-smokers In addition, teenagers are in a critical period of sexual development, and smoking reduces testosterone secretion by 20%-30%, leading to sperm reduction and deformity; Girls have delayed menarche and menstrual disorders. Smoking among teenagers will also advance the onset age of coronary heart disease, hypertension and tumors. Relevant data show that the younger you smoke, the more serious the harm to your health. /kloc-The mortality rate of smokers who started smoking at the age of 0/5 is 55% higher than that of smokers who started smoking after the age of 25, and it is 1 times higher than that of non-smokers.

Smoking damages the brain and affects intelligence. The content of carbon monoxide in tobacco smoke is very high. After carbon monoxide is inhaled into the human body, it combines with hemoglobin in the blood to form carboxyhemoglobin, which makes hemoglobin unable to combine with oxygen to form oxygenated hemoglobin, thus losing its oxygen-carrying function. Because the human brain needs a lot of oxygen, it is very sensitive to hypoxia. If you smoke too much, you will feel distracted and even have a headache and dizziness. Over time, the brain will be damaged and thinking will become dull. In this way, it will inevitably affect study and work, and make students' academic performance decline.

Adolescent amblyopia caused by smoking is called "tobacco toxic amblyopia". One of its main manifestations is visual impairment: unclear vision, which is difficult to correct with glasses. With the gradual deterioration of vision, even 0. 1 on the eye chart can't be seen clearly in a certain period of time; Second, the visual field changes: dumbbell-shaped or circular shadows appear in the middle of the visual field in the early stage, and the visual field shrinks in the later stage, and the surroundings are blurred when viewing objects; Third, color vision is often guided: in particular, it is impossible to distinguish between red and green; Fourth, photophobia: I can't see clearly under strong light. Toxic amblyopia in tobacco develops slowly and is easily ignored by people.