Liverpool City Council wanted to reduce the levels of in-home smoking (especially in front of children) in a number of their wards. Intended to sit alongside other smoking reduction efforts, this particular activity was not about stopping people smoking, but about helping them to make choices that would reduce the potential harm to them and others through secondary smoke inhalation. We spoke to a wide range of people within the target wards, exploring their attitudes to smoking in the home and understanding their responses to alternative approaches to communicating the need for change. Our findings and recommendations provided LCC with clear guidance on the future direction of the campaign and supporting information, together with a richer and deeper understanding of smoking patterns and potential nudges for changing behaviour.