Smoking and being physically inactive put depressed patients with heart disease at an even greater risk of death and heart attack, according to a study of 4,676 patients. "A substantial proportion of the relationship between elevated depressive symptoms and the risk for myocardial infarction or death was explained by behavioral mechanisms, the most important of which were smoking and physical inactivity," researchers wrote. The study was published online by the Journal of the American College of Cardiology.

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