OBJECTIVE: To measure change in adult non-smokers' exposure to secondhand smoke in public and private places after smoke-free legislation was implemented in Scotland.
DESIGN: Repeat cross sectional survey.
PARTICIPANTS: Scottish adults, aged 18 to 74 years, recruited and interviewed in their homes.
INTERVENTION: Comprehensive smoke-free legislation that prohibits smoking in virtually all enclosed public places and workplaces, including bars, restaurants, and cafes.
OUTCOME MEASURES: Salivary cotinine, self reported exposure to smoke in public and private places, and self reported smoking restriction in homes and in cars.
RESULTS: Overall, geometric mean cotinine concentrations in adult non-smokers fell by 39% (95% confidence interval 29% to 47%), from 0.43 ng/ml at baseline to 0.26 ng/ml after legislation (P
CONCLUSIONS: Implementation of Scotland's smoke-free legislation has been accompanied within one year by a large reduction in exposure to secondhand smoke, which has been greatest in non-smokers living in non-smoking households. Non-smokers living in smoking households continue to have high levels of exposure to secondhand smoke.
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