Tobacco smoke particles can leak into the apartment units of nonsmokers via air ducts, doorways and electrical fissures, putting children at risk of secondhand smoke exposure, according to a study presented to coincide with the Great American Smokeout on Thursday. A bill signed by California Gov. Jerry Brown in September is expected to expand the availability of smoke-free housing in the state, but health officials said more protections are needed. Smoke-free bans don't protect children from secondhand smoke in the places where they live, eat and sleep, Dr. Jonathan Winickoff, a professor and AAP member said.

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