Sounds to me like the doctor that prescribed that medication didn't do their job or the patient lied to the doctor. I’ve tried chantix 2 times in the past and it worked both times, started smoking again because 4-5 months down the road I would be drinking and say screw it and have a cigarette.
Here on base they have a really strict prescreening if they are going to prescribe chantix, if you have had any kind of depression or metal issues at all they don’t prescribe it as the main side effect that’s clearly printed says that it will magnify it 10 fold. These people in this article most likely already had some deep mental issues to start with; the drug just tipped them over the top.
this is the reason people need to carefully read the side effects on drugs before they put it in their body, can't knock chantix, personally I think it’s the best drug out there to help quit smoking, in my opinion and personal experience at least.