Date Published: 11/04/2006 [Source]
Radon is a colorless and odorless radioactive gas that has been estimated to cause 5,000 to 20,000 lung cancer deaths yearly. It is second only to smoking as a cause of lung cancer. It has been estimated that nearly 1 out of every 15 homes in the US has elevated radon levels.
Radon is produced when small amounts of uranium and radium in soil and rocks decay. Radon gas will also decay into smaller and radioactive particles that can be inhaled into the lungs where it can damage cells and cause lung cancer.