| Their new study runs counter to earlier research that found that people with depression had more trouble cutting back or quitting smoking.
But the report, which appeared in the November issue of Nicotine & Tobacco Research, documented an increase in symptoms of depression that occurred about a month after the smokers began trying to quit.
The study, conducted by researchers from Brown University and Miriam Hospital in Providence, looked at 133 smokers, 41 of whom had a history of depression.
The smokers were given some self-help publications and instructions to quit on a specific date, seven days after their first interview with researchers.
In later examinations, the researchers measured the smokers' and former smokers' symptoms of nicotine withdrawal and depression, as well as their success at giving up smoking.
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