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Smoking
Smoking causes most cases of lung cancer, and secondhand smoke can be a contributor, as well. However, people who have never smoked can be diagnosed with lung cancer, as well. The American Cancer Society notes that if you stop smoking before a cancer develops, your damaged lung tissue gradually starts to repair itself. No matter what your age or how long you've smoked, quitting may help you live longer. People who stop smoking before age 50 cut their risk of dying in the next 15 years in half compared with those who continue to smoke.
Exposure
Air pollution may increase the risk of lung cancer, but it is much less a risk factor than smoking. Additional causes of lung cancer may include exposure to radon, a naturally occurring radioactive gas that results from the breakdown of uranium in soil and rocks, and exposure to asbestos fibers in the workplace or home. Treatment with radiation therapy to the breast or chest may be a risk factor. Cancer-causing agents found in the workplace include radioactive ores such as uranium; inhaled chemicals or minerals such as arsenic (or arsenic in the water), beryllium, cadmium, vinyl chloride, nickel compounds, chromium compounds, coal products, mustard gas, and chloromethyl ethers; and diesel exhaust.
History of Cancer
Individuals who have had lung cancer in the past have a higher risk of developing another lung cancer. Genetics is another factor, as brothers, sisters, and children of those who have had lung cancer may have a slightly higher risk.
Combined Factors
When smoking is combined with other risk factors, the risk of developing lung cancer is increased. The American Cancer Society notes that people who are current smokers should realize that the best way to avoid dying from lung cancer is to stop smoking.
Lung Cancer Unit
Moores UCSD Cancer Center
3855 Health Sciences Drive
La Jolla, CA 92093
(866) 773-2703 |