Approximately 46% of U.S. multiunit housing residents with smoke-free home rules, 29 million persons, experience secondhand smoke infiltration in their apartments. Federal health authorities warn that secondhand smoke exposure in multiunit housing is detrimental to the health of children and nonsmoking adults. However, none of the 50 U.S. States bans smoking in privately-owned multiunit housing, and less than 0.1% of the 91,000 U.S. municipalities do.
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