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Radon is a cancer-causing radioactive gas.
When you breathe air containing radon, you increase your risk of getting lung cancer. In fact, the Surgeon General has warned that radon is the second leading cause of lung cancer in the United States today. If you smoke and your home has high radon levels, your risk of lung cancer is especially high. A gaseous highly radioactive element. Discovered by English physicist Ernest Rutherford in 1899.