['Few studies in Europe have investigated home smoking bans and their association with child smoking.', 'A nationwide survey of 12 to 18-year olds in 2005 (n = 6503, response rate 66%) was used to study home smoking bans in Finland. Multinomial logistic regression analyses were used to study association of home smoking bans and child smoking.', "Of the respondents, 58% reported a total ban, 27% a partial ban, 4% reported no ban and 10% chose the option 'I cannot say'. The lack of total ban was strongly associated with living in non-intact families, parents' lower educational level, parental smoking and parents' permissive attitude towards child smoking. Moreover, partial or no ban increased the likelihood of being a daily smoker. In the multinomial logistic regression model, the odds ratios (ORs) for children's daily smoking, adjusted for sociodemographic factors, parental smoking and their permissive attitude, were OR 2.9 [95% confidence interval (CI) 2.3-3.6] for partial ban and OR 14.3 (8.6-23.7) for no ban. In families where both parents smoked, the adjusted ORs were correspondingly 1.5 (95% CI 0.7-3.0) and 2.9 (95% CI 1.1-7.8)."] Does home smoking ban in Finland and the association with child smoking?