Data from the National Health and Nutrition Examination Surveys revealed a substantial decline in the proportion of children without asthma who were exposed to secondhand smoke, from 57.3% in 1999 to 44.2% in 2010. However, CDC researchers found that the rate of children with asthma exposed to smoke dropped very little, from 57.9% between 1999 and 2002 to 54% between 2007 and 2010.

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