Chantix/Wellbutrin to help me quit smoking? I need reasons NOT to take it please

So I'm at the end of my rope as far as smoking. I'm a fool and whatever else you want to say, but the fact is that I quit for six months with the help of nicotine patches and some other no-smoking things and lollipops.

When my insurance refused to pay for the patches any longer, (which was unknown to me till it happened), I was ok for about two weeks and then I started smoking again.

Now I really want to quit again. I was never able to quit before and even though I did get some more patches, it did not work this time.

I am seeing my doctor next week and she is willing to write me a script for Chantix or Wellbutrin. I have never taken an anti-depressant in my life and I worry about the black-box warnings, AND any kind of permanent damage or change. I'm terrified of messing with my serotonin for some reason, but mostly any permanent damage. I am a woman, and from what I have read, men can be permanently damaged by anti-depressants, (erectile dysfunction permanent), but I wonder if it can do that to a man, it must be dangerous?

So at this point-I am ready to try it, but I really would like to know what kind of permanent risks am I taking?