English that harms others' health

Smoking is harmful to every system of the human body, especially the respiratory system. Long-term smoking can cause chronic bronchitis, bronchiectasis and chronic obstructive pulmonary disease, especially the incidence of lung cancer. Epidemiological investigation shows that smoking is one of the important pathogenic factors of lung cancer, especially squamous cell carcinoma and small cell undifferentiated carcinoma. The risk of lung cancer of smokers is 13 times that of non-smokers, and the mortality rate of smokers is much higher than that of ordinary people. In addition, smoking can also cause carcinogenicity of other systems, which can be related to the incidence of lip cancer, tongue cancer, oral cancer, esophageal cancer, gastric cancer and colon cancer, and can also increase the risk of coronary heart disease.