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A ban on smoking in cars with children was implemented in April 2015 in England and December 2016 in Scotland. With survey data from both countries (NEngland=3,483-6,920 and NScotland=232-319), we used this natural experiment to assess the impact of the ban using a difference-in-differences approach. We conducted logistic regression analyses within a Difference-in-Difference framework and adjusted for age, sex, a marker of deprivation and survey weighting for non-response. Among children ageddoi:10.1101/19006353 fatcat:lv5jrsxiebgqjcfpp3xwrgbx6i