Children at Increased Risk of Negative Health Effects From Exposure to Thirdhand Smoke, Study Finds

A new study funded by the University of California's Tobacco-Related Disease Research Program found that smoke residue on carpeting and furniture, known as thirdhand smoke, could damage DNA and increase the risk of cancer. The researchers said the smoke -- which can last for several months in households and cars -- poses a particular risk to children who are more likely to touch surfaces and put items in their mouth.

• "Thirdhand Smoke Poses Health Danger, Especially to Children, Scientists Say" (Ortiz, Sacramento Bee, 3/18).