Most parents who smoke expose their children to tobacco smoke in vehicles despite the potential harm, suggests a new study in Pediatrics. Previous data have shown that smoking in a car -- even with a window down -- produces air quality similar to that of a typical smoky bar. According to the study of 795 smoking parents who had cars and responded to a survey, only 29% had a smoke-free car policy and nearly 1 in 5 of these parents reported that it was violated in the past three months. Of the 562 parents who did not report having a smoke-free car policy, nearly half (48%) said that smoking occurred with children in the car.

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