I used Chantix 4 times to stop smoking. Each time I failed my doctor would prescribe me another round and encourage me to keep trying. I did this for 2 years. I can't tell you the roller coaster of mental issues I went
through. I almost lost my marriage over it. I was incredibly aggressive, severely depressed and everything in between.
It is a very toxic and dangerous drug. I would advise anyone who is thinking of quitting smoking to seek other options. I do believe taking it for as long as I did and as much as I did has had a permanent effect on my mental health.