High risk groups for lung cancer development? 1.Smokers aged 55-74 (current and former smokers); smokers who have smoked for 30 years (number of years of smoking * number of packs smoked per day); those who have quit smoking for less than 15 years (the risk of lung cancer can only be reduced to the same level as normal people after quitting smoking for 15 years); 2.Women who have inhaled second-hand smoke for a long time; 3.People in areas with severe air pollution; 4.People who have been exposed to radiation for a long time, inside and outside the body Those who receive excessive radiation exposure, such as individuals who work in metal mines and have long exposure to inorganic arsenic, asbestos, chromium, nickel, etc., and lack protection; 5. People who have long exposure to soot or oil smoke: such as those who are exposed to gas, asphalt, coke workers, cooks and housewives who have long exposure to kitchen fumes, these people have a higher incidence of lung cancer than the general population; 6. People with family history of lung cancer; 7. The risk of developing lung cancer is 100 times higher than that of non-smokers (overall, one in ten smokers will develop lung cancer). How to diagnose early? It is recommended for high-risk people to have at least one low-dose spiral CT physical examination of the chest every year, which can help early diagnosis and improve the chances of long-term lung cancer survival. The price of low-dose spiral CT is similar to that of chest X-ray, and the radiation received is low. For heavy smokers, low-dose spiral CT of the chest is recommended once every six months (both chest X-ray and chest radiograph are easy to miss).