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    Lung Cancer - What Increases Your Risk

    A risk factor for lung cancer is something that increases your chance of getting this cancer. Having one or more of these risk factors can make it more likely that you will get lung cancer. But it doesn't mean that you will definitely get it. And many people who get lung cancer don't have any of these risk factors.


    About 85 out of 100 lung cancers are related to cigarette smoking.4Smoking cigars or a pipe may also increase your risk for lung cancer.

    Your risk of getting lung cancer increases:

    • The longer you smoke.
    • The more cigarettes you smoke each day.

    Quitting smoking lowers your risk for getting cancer, and your risk keeps going down as long as you don't smoke. Even cutting down how much you smoke may reduce your risk (but not as much as quitting completely).

    If you live with a smoker, you have a higher risk for lung cancer compared with a person who lives in a nonsmoking environment.

    For more information, see the topic Quitting Smoking.

    Other risks

    Exposure to some substances may increase your risk for lung cancer, including:

    • Marijuana. Smoking one marijuana cigarette, or a joint, may affect the lungs as much as smoking a pack of cigarettes.5
    • Certain chemicals. These include arsenic and asbestos.
    • Radiation. This includes exposure from your work place, medical tests, or from the environment (such as radioactive dust).
    • Radon gas. This includes exposure from your home or work place.
    • Air pollution. Living where the air is very polluted can increase your risk for lung cancer.

    Some gene changes (mutations) can increase the risk of getting lung cancer. These gene changes mostly occur as a person gets older.

    WebMD Medical Reference from Healthwise

    Last Updated: November 14, 2014
    This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
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