Between 2003 and 2010, 50% of all 6- to 19-year-olds, including those with asthma, were exposed to secondhand smoke, according to a U.S. study in the journal Academic Pediatrics. Exposure to secondhand smoke at even low levels was associated with more missed school days, sleeping problems, reduced physical activity and increased wheezing in 6- to 11-year-olds. "Adolescents may have more sporadic exposure (hanging with friends) compared to younger children who may be more chronically exposed at home," lead researcher Dr. Lara Akinbami said.

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