• Tara Elton-Marshall, Scott T Leatherdale, Pete Driezen, Sunday Azagba, and Robin Burkhalter.
• Department of Social and Epidemiological Research, Centre for Addiction and Mental Health, London, Ontario, Canada; Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada. Electronic address: Tara.EltonMarshall@camh.ca.
• Prev Med. 2015 Sep 1; 78: 59-64.

ObjectiveTo examine youth exposure to smoking in cars following 7 provincial bans on smoking in cars with children in Canada.MethodRepeated cross-sectional data from the 2004-2012 Youth Smoking Survey (n=91,800) were examined. Using a quasi-experimental design, contrasts of the interaction of survey year and province included in the logistic regression analyses were used to test whether exposure significantly declined pre-post implementation of a ban on smoking in cars relative to control provinces not implementing a ban.ResultsExposure across all provinces declined from 26.5% in 2004 to 18.2% of youth in 2012. Exposure declined significantly from pre to post implementation of a ban on smoking in cars with children in Ontario at time 1 post ban (Pre-Ban=20.4% T1post=10.3%, OR=0.45), time 2 post ban (12.1%, OR=0.61) and time 3 post ban (11.6%, OR=0.58) relative to control provinces that did not implement a ban. In British Columbia exposure to smoking in cars declined significantly at pre-post ban time 3 compared to the control group (Pre-Ban=21.2%, T3post=9.6%, OR=0.51). No other provinces had a significant change in exposure pre-post ban relative to the control provinces.InterpretationAlthough rates declined, significant differences were only found in Ontario relative to control provinces in the immediate and long term.Copyright © 2015 Elsevier Inc. All rights reserved.

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