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Radon is the second leading cause of lung cancer in America, after cigarettes. This gas naturally wafts up from the ground and can get trapped inside your home, where it builds to dangerous levels. You can get a radon-testing kit for less than $20 at RadonZone.com
; the best time to test is winter, when our homes tend to be most tightly insulated. If your levels are elevated, contact your state's radon program (find it at epa.gov/radon/whereyoulive.html
) and ask about ways to reduce your exposure.