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You can't see or smell radon gas, but it might be seeping into your home from the ground below. It's a natural radioactive gas that forms when uranium in soil breaks down. Long-term exposure is the second leading cause of lung cancer after smoking. Testing your home is the only way to know if you're at risk, and it's easy to do with a simple kit from a hardware store. Fixing the problem usually involves installing a vent pipe system to pull the gas away.