Does Quitting Smoking Affect Depressive Symptoms? A Longitudinal Study Based on Treatment-Seeking Smokers with a History of Depressive Episode

This study analyses changes in depressive symptomatology as a function of smoking status over time after a cognitive-behavioural intervention for smoking cessation among smokers with a history of depressive episode. The sample comprised 215 smokers with antecedents of depressive episode (M_age=45.03; 64.7% female). Depressive symptoms were assessed using BDI-II at baseline, end of intervention and at 3-, 6- and 12-month follow-ups. Depression was examined according to smoking status at 12-month follow-up: abstainers, relapsers and smokers. The linear mixed model showed a significant effect for time (F = 11.26, p < .001) and for the interaction between smoking status and time (F = 9.11, p < .001) in the variations in depression. Abstinent participants at 12 months experienced a reduction in depressive symptomatology. This change was significant when comparing abstainers to smokers and relapsers. The present study suggests an association between abstinence and reductions in depressive symptomatology for smokers with a history of depressive episode after an intervention for smoking cessation.