Pfizer's stop-smoking drug Chantix (varenicline) can lead to a small increase in cardiovascular problems such as heart attacks for patients who already have cardiovascular disease, U.S. drug regulators said on Thursday. In fact, The Food and Drug Administration (FDA) is changing the label for Chantix after reviewing the results of a clinical trial. Annual sales are now about $800 million, making the pill a "moderate sized" product for the pharma giant... 
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