What are the residual side effects are after taking chantix?

Really none: Have been reported that persist after the drug is stopped. There is a great deal of controversy over whether suicidal thoughts or actions are truly increased with chantix, since such thoughts/actions occur in people stopping smoking in general, and not all studies have shown this. Same with the cardiac problems. I have mostly seen vivid dreams and nightmares, and they have gone away after stopping.