You aren't missing anything. I thought the very same thing until I read long insert with the info that comes with Chantix. It says in rare cases that it may cause MS! It was enough for me to know that I was not going to risk taking it!

I have heard from many people that it worked well for them and they stopped smoking. They didn't have any major health problems. My best friend has Lupus and she couldn't take it.

It is quite a statement from Pfizer since nobody knows what causes MS. I'm confused about it also but maybe they know something we don't know.