You may already know that smoking is the number one cause of lung cancer in the United States. But do you know what’s number two?
The answer is radon, an invisible, radioactive gas—and if you didn’t know, you’re not alone.
“Radon is a serious public health problem and a lot of people don’t know about it,” says Robert Whitcomb, PhD, at the Centers for Disease Control and Prevention in Atlanta, Georgi…