Chantix and three months

I took Chantix for about a month. It lessened my cravings to smoke, but I started getting heart palpitations really bad. I ended up in the ER one day and the Dr. told me that he had never seen that side effect. He looked up the side effects in his palm pilot, and found that it was the very last side effect in the list. I decided to get off Chantix to see if that would help. Well now I'm going to be on Toprol for the rest of my life. They won't say for certain whether it was the Chanitix that caused it or not. Coincidence? I'm not sure. All I know, is that my heart was completely fine before it, and now if I am an hour late taking the Toprol my heart goes insane. My cardiologist has no clue what happened (I've been to two). I'm only 33 years old, and taking this medication for the rest of my life.
Has anyone experienced heart palpitations after starting Chantix?

I started taking Chantix in August right after I had my teeth cleaned by a periodontal office which I was doing every three months. Three months later my periodontal disease which had been controlled for four years came back full force. I had just had an implant placed in July and now am in fear of losing it along with some other teeth. I have had to have new bone graphs and gigival flap cleanings trying to stop the problem. I have now been off the drug four months and things seem to be going better. PLEASE CHECK WITH YOUR PERIODONTIST IF YOU HAVE EVER HAD PERIODONTAL DISEASE BEFORE TAKING THIS DRUG.