Smoking with children in a car has been illegal since 2015 in England and 2016 in Scotland. This podcast explores the importance and impact of this ban on children and the important message it gives to the public to ensure smoking rates continue to fall. Listen to the conversation between Rachael Moses and Dr Anthony Laverty, Public Health Policy Evaluation Unit, School of Public Health, Imperial College London, London, UK and lead author of https://thorax.bmj.com/content/early/2020/01/08/thoraxjnl-2019-213998