U.S. SURGEON GENERAL HEALTH ADVISORY
"Indoor radon is the second leading cause of lung cancer
in the United States and breathing it over prolonged
periods can present a significant health risk to families
all over the country. It's important to know that this
threat is completly preventable. Radon can be detected
with a simple test and fixed through well-established
venting techniques." January 2005
http://www.epa.gov/radon/pubs/consguid.html