Researchers from Johns Hopkins University, Wake Forest University and University of East Anglia have found more potential and real heart problems related to Chantix (varenicline), a Pfizer drug that in intended to curb smoking habits. In a review heart problems among 8,216 participants in 14 previously conducted stop-smoking trials, all but one of which excluded people with a history of heart disease. The analysis found that 1.06%, or 52, of the 4,908 participants treated with Chantix reported serious adverse cardiovascular results, versus 0.82%, or 27, of the 3,308 given placebos... 
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