Aims: The effect of successful and unsuccessful smoking cessation on depressive mood, anxiety- and suicide-related outcomes is unclear. The aim of this secondary analysis was to explore the relationship between abstinence status and these outcomes.
Design: Cohort of adult smokers attempting to stop smoking. Smoking status was assessed by a daily diary; depressed mood, anxiety and suicidal tendencies by the Hamilton Depression Rating Scale (HDRS). The association of complete and point-prevalence abstinence with the HDRS variables was assessed using multi-level linear regression models.
Setting: Randomized trial of sertraline versus placebo for smoking cessation with weekly behavioural support provided in a clinic.
Participants: A total of 133 adult smokers with past major depression.
Findings: Pre-quit mood scores did not predict smoking status post-quit day. Both continuous and point-prevalence abstainers had significantly lower total HDRS, suicide and anxiety scores, adjusted for all potential confounders, during the period following quit day than did non-abstainers who experienced a significant mood deterioration. There was a significant effect of sertraline on post-quit HDRS scores but not on abstinence.
Conclusions: Contrary to expectation, smoking abstinence among smokers with a history of major depression did not lead to increase in depression, anxiety or suicide ideation; however, failed quit attempts did. Persisting with a quit attempt while unable to achieve abstinence may be associated with mood deterioration.
© 2010 The Authors, Addiction © 2010 Society for the Study of Addiction.