Long-term exposure to radon gas is often deadly. Radon is the leading cause of lung cancer in non-smokers and the 2nd leading cause in smokers. Every year in the United States, around 21,000 people die due to radon-related lung cancer. Your risk is increased by both the levels of radon in your home and your time of exposure.

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If you are a smoker or have recently quit smoking, or have a family history of lung cancer you are at a higher risk from radon. Children may also be at higher risk. 

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The EPA has set the radon action level at 4.0 Picocuries/liter. This is the level at which a homeowner should have their home's radon mitigated. However, exposure to any level of radon can have damaging effects and homes above 2.0 pc/l should consider radon mitigation.