INTRODUCTION
depression, depression/anxiety
Individuals with depression/anxiety are twice as likely to smoke than those without depression/anxietyAnother Cochrane review found that smoking cessation interventions offered alongside mood management support led to higher cessation rates compared to smoking cessation interventions alone for people with depression (risk ratio 1.47, 95% CI: 1.13–1.92),Integrated interventions may be more effective for quitting smoking for various reasons. For example, cognitive behavioural techniques (CBT) could alter unhelpful beliefs about the relationship between smoking and depression/anxiety (e.g., ‘smoking helps my mood’),There are some evidence‐based models that we can use to investigate mechanisms of behavioural change. The Capability, Opportunity, Motivation‐Behaviour model (COM‐B model)Understanding mechanisms of behavioural change and how they fit into evidence‐based frameworks could improve our understanding of the active intervention components and help identify therapist characteristics that optimize therapeutic benefits, potentially leading to more effective and streamlined interventions.Addiction research has been criticized for excluding the patient's view and focussing on intervention techniques rather than intervention mechanisms.In this qualitative investigation, we aimed to use evidence‐based models of behaviour change and behavioural intervention development