A study shows that people who quit smoking are less depressed and have an improved mood:
"Quitting smoking is certainly healthy for the body, but doctors and scientists haven't been sure whether quitting makes people happier, especially since conventional wisdom says many smokers use cigarettes to ease anxiety and depression. In a new study, researchers tracked the symptoms of depression in people who were trying to quit and found that they were never happier than when they were being successful, for however long that was.
Based on their results, the authors of the article published online Nov. 24 in the journal Nicotine & Tobacco Research recommend that smokers embrace quitting as a step toward improving mental as well as physical health, said Christopher Kahler, corresponding author and research professor of community health at the Warren Alpert Medical School of Brown University. Quitting is not, as some smokers may fear, a grim psychological sacrifice to be made for the sake of longevity.
"The assumption has often been that people might smoke because it has antidepressant properties and that if they quit it might unmask a depressive episode," said Kahler. "What's surprising is that at the time when you measure smokers' mood, even if they've only succeeded for a little while, they are already reporting less symptoms of depression.""
Read More: http://www.sciencedaily.com/releases/2010/12/101202124236.htm