Reciprocal associations between smoking cessation and depression in older smokers: findings from the English Longitudinal Study of Ageing.

Abstract

Depression is a particular problem in older people and it is important to know how it affects and is affected by smoking cessation. To identify reciprocal, longitudinal relationships between smoking cessation and depression among older smokers. Across four waves, covering six years (2002-2008), changes in smoking status and depression, measured using the 8-item Centre for Epidemiologic Studies Depression Scale, were assessed among recent ex-smokers and smokers (n = 2375) in the English Longitudinal Study of Ageing. In latent growth curve analysis, smoking at baseline predicted depression caseness longitudinally and vice versa. When both processes were modelled concurrently, depression predicted continued smoking longitudinally (B(β) = 0.21 (0.27); 95% CI = 0.08-0.35) but not the other way round. This was the case irrespective of mental health history and adjusting for a range of covariates. In older smokers, depression appears to act as an important barrier to quitting, although quitting has no long-term impact on depression.