I. For high-risk groups. 1. Smokers. The risk of lung cancer is 9-10 times higher in smokers than in non-smokers, and even 10-25 times higher in heavy smokers. In addition, if your home is often “smoky”, even if you don’t smoke, your risk of developing the disease will be high. 2. People who are often exposed to pollutants. Traffic police, teachers who use a lot of chalk for a long time, people who are exposed to asbestos, ionizing radiation, microwave radiation, etc. at work will have a much higher risk of lung cancer. 3.People who have a history of lung diseases. 4.People with family history of lung cancer. Second, the right equipment should be chosen for screening. Low-dose spiral CT can screen lung cancer more accurately. Find a regular specialist hospital and a specialist doctor for diagnosis.