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1. Smoking. Your risk of lung cancer increases with the number of cigarettes you smoke each day and the number of years you have smoked. Quitting at any age can significantly lower your risk of developing lung cancer.
2. Exposure to secondhand smoke. Even if you don’t smoke, your risk of lung cancer increases if you’re exposed to secondhand smoke.
3. Previous radiation therapy. If you’ve undergone radiation therapy to the chest for another type of cancer, you may have an increased risk of developing lung cancer.
4. Exposure to radon gas. Radon is produced by the natural breakdown of uranium in soil, rock, and water that eventually becomes part of the air you breathe. Unsafe levels of radon can accumulate in any building, including homes.
5. Exposure to asbestos and other carcinogens. Workplace exposure to asbestos and other substances is known to cause cancer.
6. Arsenic.
7. Chromium.
8. Nickel.
9. Family history of lung cancer. People with a parent, sibling, or child with lung cancer have an increased risk of the disease.