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[extract] A recent study conducted by a group of British researchers found that smoking drivers expose their passengers to high levels of second-hand smoke. The study is conducted over 100 trips by 17 drivers, of which 14 were smokers. Of those trips made, 34 were smoke-free. The study is said to be the most extensive ever. The recommended safe level of pollutants in a car cabin is below 25 μg/m3, according to the United Nations
