I also smoked 40+ years, at times 2 packs a day, and quit. The second time I had cancer did the trick for me. The first time, the doctor told me to quit and I ignored him. The second time I decided to listen. I used Chantix, and it worked for me. Used it for one month, then thought to myself that if I could go a month without smoking, I didn't need the pills anymore. I haven't smoked in 3 1/2 years. Like others have said, it's not just the Chantix that works,
you have to want to quit. I don't even get the urges anymore. You can do it!