'Thirdhand' smoke may pose health risks

Families living in smoke-free homes may still be affected by deadly tobacco carcinogens, the Daily Mail reports. “Thirdhand" smoke—tiny cigarette-related carcinogens that are passed from smokers to nonsmokers—can lurk in house dust, on surfaces, and in clothing, a study in Environment International suggests. Researchers measured the carcinogenic levels of dust collected from nonsmoking and smoking homes and found that in both environments the cancer risks exceeded limits imposed by the Environmental Protection Agency for children 6 years of age and younger.

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