Smoking is the main cause of lung cancer

The causes of lung cancer are complex, but the most concerned one is smoking. A large amount of epidemiological survey data and scientific experiments have proved that smoking is related to lung cancer. The number of people who smoke more than 20 cigarettes a day who suffer from lung cancer is 7-13 times that of non-smokers, which shows that the more you smoke, the greater the chance of lung cancer; the earlier you start smoking, the greater the chance of lung cancer. The chance of lung cancer for smokers who start smoking before the age of 10 is 7 times that of smokers who start smoking after the age of 20; the chance of lung cancer for passive smokers is 3-4 times greater than that of non-smokers, which shows that smoking harms others and oneself. These passive smokers are often family members, relatives, friends and colleagues of smokers. Cilia in the respiratory epithelial tissue of smokers degenerate and fall off, losing the function of removing secretions, and cells become deformed, octagonal or squamous metaplasia, which is also a prelude to cancer.

The progress of modern science has made us realize that the smoke produced when tobacco is burned contains more than 3,000 harmful chemicals. The most important of these are nicotine, tar and carbon monoxide, which are harmful to human health and cause cardiovascular and cerebrovascular diseases, respiratory diseases, malignant tumors, etc. Studies have shown that 1/7 of new cancer cases are related to smoking. Researchers have found more than 3,500 chemicals in smoke particles, of which at least 43 are carcinogens.