Chantix is basically just Wellbutrin and has been used to treat depression.
So yes Chantix has been used to treat other things such as depression than just preventing and stopping nicotine addiction.
Chantix is Wellbutrin under another name.
You should begin feeling the effects of the Chantix within a few weeks to a month of taking the Chantix to stop smoking.
However it can take as long as 12 weeks to get where you'll hopefully stop smoking for good.
However some people report it took them a bit longer as in 15 to 16 weeks before they fully stopped smoking.
It can vary from person to person but most people who use Chantix to stop smoking stop smoking within 12 weeks.
My brother took Chantix and stopped smoking fully within 12 weeks so that's good news and he no longer smokes which I'm glad for him.