What are the causative factors of lung cancer? The incidence of lung cancer is related to these 4 factors

Since many people do not know the cause of lung cancer, some people only know that smoking can cause lung cancer, but do not know much about other causes of the disease. Therefore, the following will introduce the pathogenic factors of lung cancer, hoping to help everyone understand the cause of lung cancer.

1. Tobacco factors Smoking is one of the factors that cause lung cancer. The increase in the incidence of lung cancer is in parallel with the increase in cigarette sales. Cigarettes contain a variety of carcinogens such as benzopyrene. Experimental animals that inhale cigarette smoke or apply tar can induce respiratory and skin cancer. The incidence of lung cancer in smokers is 10 times higher than that of non-smokers. The incidence of heavy smokers is even higher, 20 times higher than that of non-smokers. At the end of this century, with the increasing number of female smokers in Western European countries, the incidence of lung cancer in female patients has also increased significantly.

Among clinically diagnosed lung cancer cases, about 80% smoke more than 20 cigarettes a day for more than 30 years. In the past 20 to 30 years, the smoking situation in my country has been very serious. Nearly 300 million people have the habit of smoking. The smoking rate of male adults in major cities such as Beijing, Tianjin, and Shanghai is nearly 50%, and that of females is nearly 5%. There are also many smokers among young people. If necessary measures are not taken to control and discourage smoking, the incidence of lung cancer in my country will inevitably increase further in the next 10 to 30 years.

2. Air pollution According to the survey: air pollution is also a factor that causes lung cancer. The incidence rate is higher in factory and mining areas than in residential areas, higher in cities than in rural areas, and higher in industrially developed countries. The main reason is that in industrially and traffic-developed areas, the combustion of oil, coal, and internal combustion engines, as well as asphalt road dust, produces harmful substances such as benzopyrene carcinogenic hydrocarbons that pollute the atmosphere. Survey materials show that the incidence rate of lung cancer also increases in areas with high concentrations of benzopyrene in the atmosphere. Air pollution and smoking may promote each other and play a synergistic role in the incidence rate of lung cancer.

3. Lung diseases such as tuberculosis, silicosis, and pneumoconiosis can coexist with lung cancer. The incidence of cancer in these cases is higher than that of normal people. In addition, chronic inflammation of the lung bronchus and pulmonary fibrosis scar lesions may cause squamous metaplasia or hyperplasia during the healing process. On this basis, some cases may develop into cancer.

4. The body's immunity, such as family inheritance, as well as reduced immune function, metabolic activity, endocrine dysfunction, etc. may also play a certain role in the incidence of lung cancer.