Nathan thank you for posting this omg... my 13 y/o son is begging me to go back to smoking and get off the chantix... and I can tell it does make me short tempered but I know that I have only had 2 days that I really wanted to smoke this time. I was thinking about cutting back on the chantix but I have quit smoking twice before for over 4 months so I dont want to be rash in judgment yet either. I am seeing my dr monday and will discuss this with her and will most likely follow her advice but at least now I know that Im not the only one thats having side effects... Im not much of a sleeper anyhoo but when I do sleep it is unreal at the dreams I have now omg... I use to nvr dream... anyhoo, the best of luck to you and thank you again for this post