Systematic review of behaviour change techniques within interventions to reduce environmental tobacco smoke exposure for children

Children are particularly vulnerable to environmental tobacco smoke (ETS). There is no routine support to reduce ETS in the home. We systematically reviewed trials to reduce ETS in children, to identify intervention characteristics and behaviour change techniques (BCTs) to inform future interventions. We searched Medline, EMBASE, CINAHL, PsycINFO, ERIC, Cochrane Central Register of Controlled Trials, and Cochrane Tobacco Addiction Group Specialised Register from January 2017-June 2020 to update an existing systematic review. We included controlled trials to reduce parent/caregiver smoking or ETS in childre