I. The high incidence of lung cancer is related to environmental pollution The incidence of lung cancer in China is increasing year by year, and there are about 600,000 new cases of lung cancer every year. The reason why so many people worry about the nodules in their lungs is largely due to the high incidence of lung cancer. What causes how high the incidence of lung cancer is? Although no exact cause has been found yet, it has a lot to do with smoking, fumes, air pollution, and new house renovation in our life: 1. Smoking is the number one cause of lung cancer. People who smoke too much are one of the high-risk groups for lung cancer; 2. Then, kitchen fumes, which can also induce lung cancer. If you are a full-time housewife, it may have a lot to do with cooking at home every day and inhaling a lot of fumes; 3. If you go out of the house, the occurrence of lung cancer is related to air pollution, and it is necessary to talk about the PM2.5 index which is very hot now. This extremely fine dust can be directly inhaled into the alveolar tissue and cause harm to health after long-term retention; 4. Factors such as new room decoration, occupation and genetic quality may induce lung cancer. Second, annual chest CT for high-risk people can screen out early lung cancer “Cancer is not scary.” Medical professionals always comfort patients in this way, but some information shows that the overall 5-year survival rate of lung cancer is only 13.9%, and the survival rate of lung cancer at different stages varies greatly. For example, the 5-year survival rate of inoperable advanced lung cancer is only 2-3%; the 5-year survival rate of mid- to late-stage lung cancer that can be surgically removed is about 20-40%; while the 5-year survival rate of early-stage lung cancer, especially those below 2 cm in diameter, can reach 90-100%. Such a disparity in survival rate can only illustrate one thing: the most effective and critical aspect of lung cancer diagnosis and treatment is time. Only early detection, early diagnosis and early treatment can effectively improve patient’s healing and increase survival rate. However, because there is no distribution of body nerves in the lung, lung cancer is painless in early stage, so it is difficult to be perceived from symptoms, and then it has to be detected through auxiliary examinations. Chest X-ray is relatively less recognizable and CT is more effective. During 1994-2005, the International Action Plan for Early Lung Cancer Screening applied low-dose spiral CT to screen 31,567 asymptomatic people with lung cancer risk (history of smoking or risk of occupational exposure, such as asbestos and beryllium exposure). The results identified 484 lung cancer patients, 85% of whom had clinical stage I lung cancer (i.e., early-stage lung cancer), and 302 of whom were treated with surgery within 1 month of diagnosis, with a 10-year survival rate of 92%. People who are over 40 years old; or have a long history of smoking, with a smoking index of 400 years or more (the number of years of smoking multiplied by the number of cigarettes smoked per day); or work in a closed environment for a long time; or work in an environment with a lot of dust particles for a long time; or have a family history of lung cancer, should receive at least one chest CT examination every year to help early detection and diagnosis of lung cancer. With the gradual increase of incidence rate, people pay more attention to the prevention methods of lung cancer. For the current practice of wearing masks to block PM2.5, it hardly works. It is better to reduce outdoor activities on cloudy days and close doors and windows when indoors. In addition, Chinese medicine believes that often eat “white food” has the effect of lung cleaning and lung moistening, such as white radish, yam, white fungus, snow pear, white chrysanthemum, lotus seeds, almonds, etc. are good choices.