December 14, 2011   The most comprehensive study to date of second-hand smoke exposure among non-smoking adults in England, which was funded by the Department of Health, will be published online today in the journal Environmental Health Perspectives. Researchers analysed data from seven national surveys conducted between 1998 and 2008. These surveys measured cotinine, an indicator of tobacco smoke exposure, in saliva samples from over 30,000 people aged 16 and over. They showed that levels of exposure to second-hand smoke in non-smokers had been declining in the ten years leading up to smoke free legislation. But even when this decline was taken into account, the introduction of smoke free public places led to significant, additional reductions in exposure. Average exposure fell by 27 per cent immediately following the legislation.

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