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Pfizer's drug, Chantix, has already been linked to psychiatric side effects, but now has been found to increase the risk of heart attack in people with a history of heart disease. The risk in the placebo group was 0.9% and in the group on Chantix the risk was 200% higher with a percentage of 2.0. 2.3% needed coronary bypass procedures compared to 0.9% in...