Persistent smokers may have higher risk to become depressed than never smokers

Based on a Finnish study, persistent smokers may have higher risk to become depressed in comparison to never smokers. Also those smokers who quit have an elevated risk of depressive symptoms in short run. However, in long run this risk declines to the level of never smokers. In other words, both completely smoke-free life style and successful smoking cessation in long run seem to protect from depressive symptoms.