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Smoke-free air laws effective at protecting children from secondhand smoke
Date:6/6/2010

Boston, MA Researchers at the Harvard School of Public Health (HSPH) have found that children and adolescents living in non-smoking homes in counties with laws promoting smoke-free public places have significantly lower levels of a common biomarker of secondhand smoke exposure than those living in counties with no smoke-free laws.

The children living in non-smoking homes in U.S. counties with smoke-free laws had 39% lower prevalence of cotinine in their blood, an indicator of tobacco smoke exposure, compared to those living in counties with no smoke-free laws. Children living in homes with smokers exhibited little or no benefit from the smoke-free laws.

The study appears in the June 7, 2010 advance online edition of the journal Pediatrics.

"The findings suggest that smoke-free laws are an effective strategy to protect both children and adults from exposure to secondhand smoke. In addition, interventions designed to reduce or prevent adults from smoking around children are needed," said Melanie Dove, who received her doctorate in environmental health at HSPH in 2010 and led the study.

The HSPH researchers examined data from the 1999-2006 National Health and Nutrition Examination Survey (NHANES), a cross-sectional survey designed to monitor the health and nutritional status of the U.S. population. They analyzed the cotinine levels in 11,486 nonsmoking youngsters, aged 3-19 years, from 117 counties, both with and without exposure to secondhand smoke in the home.

In addition to a 39% lower prevalence of detectable cotinine, the researchers also found that children in non-smoking homes had 43% lower mean cotinine levels.

Over the past decade the number of state and local smoke-free laws in the nation has grown significantly. For example, the number of smoke-free laws in workplaces, restaurants and bars in the U.S. has increased from 0 in 1988 to 175 in 2006.

"These laws have been shown to re
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Contact: Todd Datz
tdatz@hsph.harvard.edu
617-998-8819
Harvard School of Public Health
Source:Eurekalert

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