A risk factor is something that increases your chances of developing cancer. Decreasing certain exposures may help lower your risk of lung cancer:

• Quitting smoking is an important step in preventing most cancers, but none so much as lung cancer. In addition, for those who smoke, it takes the body longer to fight infections and heal wounds. The sooner smoking is stopped, the sooner the body can start to heal. Talk to your doctor about the options available to help you successfully quit. If you do not smoke, try to avoid smoking areas. Secondhand smoke has been linked to an increased risk of lung cancer.
• Avoid or reduce occupational exposure to certain chemicals —People who work in the coal industry, construction, or who are exposed to by-products of combustion may come into contact with harmful substances. If possible, try to find work in a different environment. If it is unavoidable, take steps to protect yourself from exposure. Check with the National Institute for Occupational Safety and Health or the Environmental Protection Agency about any available protective guidelines.
• Avoid or reduce environmental exposure — Radon gas levels in your home can be measured by a professional or with a home test kit. If you use chemicals at home, wear a mask, gloves, goggles, and protective clothing. Using proper ventilation can also help reduce your exposure.