Close? Keys? Words: 250 words in the second grade of healthy primary school
Word count: 250 words composition
This article is applicable to: the second grade of primary school.
Composition source:
This composition is a 250-word composition about the second grade of primary school, entitled "Smoking is harmful to health". Everyone is welcome to contribute enthusiastically. Maybe many parents like smoking, but they don't know that tobacco smoke contains at least three dangerous chemicals: tar, nicotine and carbon monoxide. Tar is a mixture of several substances, which will be concentrated into a viscous substance in the lungs. Nicotine is an addictive drug, which is absorbed by the lungs and mainly affects the nervous system. Carbon monoxide reduces the ability of red blood cells to deliver oxygen to the whole body.
A person who smokes/kloc-0.5 to 20 cigarettes a day is four times more likely to develop lung cancer, oral cancer or laryngeal cancer and die than a non-smoker. The mortality rate of 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.
So I advise you not to smoke.