Another reason to quit puffing: "thirdhand smoke," what researchers are now calling the toxins from tobacco smoke that cling to clothing, hair, and upholstery even after the secondhand smoke has cleared. "People think that if they can't see the smoke, it's okay," says Jonathan Winickoff, M.D., author of a Harvard Medical School study that examined public awareness of thirdhand smoke. "But parents need to ask whether they can still smell it." Want help quitting? Call 800-QUIT-NOW.

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