What are the side effects of chantix? The stop smoking pill.?

What are the side effects of chantix? The stop smoking pill.?
The biggest complaint I get from patients pertains to abnormal dreams, not always fruitless, but vivid. There are others as with any pill, but this seem to be the most discussed. It is 20% more effective after 6 months than Wellbutrin, so the hoped for side effect is cessation.
Oh for crying audibly just quit minus the dang pill.