A Cincinnati Children's Hospital Medical Center study finds links between environmental tobacco smoke -- even at extremely low levels -- and reading, math, logic and reasoning declines in children and teens. The study, which appears in the January 2005 issue of Environmental Health Perspectives, finds a nearly three-point decline in a standardized reading test and a nearly two-point decline in a standardized math test, given an average score of 100 and a modest increase in exposure to environmental tobacco smoke.

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