This study assessed tobacco smoke chemicals in air and settled dust from private cars in Spain and the United Kingdom. Researchers examined cars from nonsmokers, smokers who do not smoke in their cars, and smokers who do smoke in their cars.  While pollutant levels were highest in cars where smoking occurred, all vehicles had detectable levels of second- and thirdhand smoke. These finding emphasize the importance of policies prohibiting smoking in vehicles and promoting broader strategies to reduce tobacco smoke exposure.

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