Suicidal thoughts is actually a very common side effect from taking a LOT of medications. I have no idea why, But it happens to a lot of people. Mostly young adults though. Also TERRIFYING nightmares are a common side effect. I'm not surprised at all by this, when I was a teenager I was put on meds because I was acting out and being a "teenager", and they made me feel crazy, depressed, and have .......*D up dreams.
Then again I was/am a genuinely happy person, and in NO way needed to be on medication.
Medication tends to make normal people crazy. Which is why I am not shocked by this. Medication messes with your brain chemistry, and Guessing that the people taking chantix were average "normal" people, it made them depressed.
Nothing against crazy people. <3 'Em... Just saying that people that don't have chemical imbalances don't do well with most meds. Even "quit smoking" pills.