Sudden weight loss

Patient: I have lost alot of weight lately without even trying 5 lbs this week alone. I have gone from 230 to 187. Plus my heart rate has droped. it went from 100 bpm to 65 bpm. it has always been 100. the only thing that has changed was that i have quit smoking . I am only using the electronic cigarettes now. any thought on what could be wrong?