2007-06-01 Smoking may increase risk of depression

http://www.reuters.com/article/2007/06/01/us-smoking-increase-risk-idUSELK15762720070601

(Reuters Health) - Persistent smokers appear to be at increased risk for becoming depressed compared to never smokers, results of a long-term study of Finnish twins suggest. On the other hand, this association was not seen in individuals who stopped smoking many years ago.

"Although nicotine in cigarettes has some mood-elevating properties, in the long-run chronic exposure to cigarette smoke may have a more important role in the etiology of depressive symptoms," lead author Dr. Tellervo Korhonen from the University of Helsinki told Reuters Health.(Read entire article)

Depression and Smoking

http://psychcentral.com/library/depression_smoking.htm

Depression is associated with an increased frequency of smoking. Addicted smokers are characterized by preoccupation with smoking, abnormal attachment to cigarettes and anticipation of brain reward from the drugs in cigarette smoke. Attempts to quit smoking often lead to a decreased level of pleasure and undesirable mood swings. Thus, once the brain has adapted to the daily dose of the drug, it seems abnormal to the brain if the user attempts to abstain.

Individuals with underlying or current depressive symptoms are more likely to experience mood disturbances when they attempt to quit. Furthermore, it appears that smoking may mask an underlying depression in some smokers. (Read entire article)