Lung cancer forms in the tissue of the lung, usually in the cells lining the air passages. The lungs are the organs we use to breathe. Cigarette smoking is the single most crucial risk factor for, and leading cause of, lung cancer. Exposure to radon is the second leading cause of lung cancer. Read more about lung cancer.
Measures are presented as either annual data at the state level or as five year aggregate data at the county level.
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