radon lung cancer risk 2

https://aged-wiki.win/index.php/New_Report_Highlights_Radon_Zone_1_Pennsylvania_Risks_for_Homeowners

Radon is a naturally occurring radioactive gas that seeps from the ground into homes, especially basements. Long-term exposure can damage lung tissue and significantly increase the risk of lung cancer, making it the second leading cause after smoking. Testing your home for radon is straightforward and the only way to know if you're at risk.