Objective: To examine change in home smoking restrictions one year after introduction of Scottish smoke-free legislation, and whether type of restriction impacts upon secondhand smoke (SHS) exposure among children.
Design: Comparison of nationally representative, cross-sectional, class-based surveys carried out in the same schools before and after legislation.
Participants: 2527 primary schoolchildren (aged around 11 years) surveyed in January 2006 and 2379 in January 2007.
Outcome measures: Self-reported home smoking restrictions, salivary cotinine concentrations.
Results: Children surveyed after implementation of legislation were more likely than those surveyed before its introduction to report complete home smoking restrictions as opposed to partial (relative risk ratio (partial vs complete) 0.75 (95% CI 0.63 to 0.89) or no restrictions (RR (no restrictions vs complete) 0.50 (0.40 to 0.63). Children living with smokers were less likely to have stringent restrictions in place compared with children living with non-smokers (for both vs neither parents smoke: RR (partial vs complete) 18.29 (13.26 to 25.22) and RR (no restrictions vs complete) 104.73 (70.61 to 155.33). Among smoking households, restriction type varied according to the number and gender of parents who smoke. In both smoking and non-smoking households, children’s SHS exposure was directly related to type of home smoking restriction, with lowest exposures among those reporting complete restrictions.
Conclusion: This study has shown an increase in the proportion of children reporting a complete ban on smoking in their household after the introduction of smoke-free legislation and supports growing evidence of the wider impact smoke-free legislation can have on smoker behaviour. However, quitting smoking combined with complete home smoking bans will still afford children the best protection from SHS exposure.
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An online appendix is published online only at http://tobaccocontrol.bmj.con/content/vol18/issue5
Contributors PCA participated in research design, managed the CHETS survey, prepared study material, analysed the data, interpreted the data analysis and led the preparation of drafts of the manuscript. SJH participated in research design and preparation of drafts on the manuscript. DBC participated in research design, data analysis, interpretation of data analysis and preparation of drafts of the manuscript. RZ participated in data analysis. CEC, as principal investigator, is the guarantor. She participated in research design and preparation of drafts of the manuscript.
Funding NHS Health Scotland and the Scottish Government.
Competing interests None.
Ethics approval School of Education Ethics Committee, University of Edinburgh,
Provenance and peer review Not commissioned; externally peer reviewed.
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