radon lung cancer risk 3

https://getradonnewhomesspot.clarionvale.com/posts/radon-in-new-homes-why-builders-and-buyers-must-address-the-risk-now

You can't see or smell radon, but if it's seeping into your home from the ground, it could be increasing your risk of lung cancer. It's the second leading cause after smoking, and the danger comes from breathing in radioactive particles that damage lung tissue over time.