Not smoking: the best way to prevent lung cancer is to never smoke.
Quitting smoking: smokers can decrease their risk of lung cancer by quitting. In a person who has quit smoking, the chance of preventing lung cancer depends on how many years and how much the person smoked and the length of time since quitting. After a person has quit smoking for 10 years, the risk of lung cancer decreases 30% to 50%.
Lower exposure to workplace risk factors: laws that protect workers from being exposed to cancer-causing substances, such as asbestos, arsenic, nickel, and chromium, may help lower their risk of developing lung cancer. Laws that prevent smoking in the workplace help lower the risk of lung cancer caused by secondhand smoke.
Lower exposure to radon: decreasing radon levels may lower the risk of lung cancer, especially among cigarette smokers.
The following factors may decrease the risk of lung cancer:
Diet: some studies show that people who eat high amounts of fruits or vegetables have a lower risk of lung cancer than those who eat low amounts.
Physical activity: some studies show that people who are physically active have a lower risk of lung cancer than people who are not.