I recognized they were not normal so I quit taking it
That is a key point. The company has warnings stating to quit taking it if you have thoughts of suicide, etc, but I'm reminded of Prozac in the 1980's. My mother suffers from chemical depression and tried Prozac when it first came out. She suffered strong thoughts of suicide, but like many people who suffer depression, she kept it to herself, thinking she was going crazy - even with the warnings. I can't remember how it finally came out, but we got her off it and she was much better. Only later did we find out that at some points she was seriously considering killing herself!
So, would some of these people taking Chantix even realize that their feelings of suicide are related to the Chatix or would they be so deep in it that it wouldn't matter? How do "warnings" help with that - especially if someone who was self-medicating mild depression with nicotine doesn't realize that is what they are doing or that they even have depression?
Scary stuff.