I took chantix for one month......just enough time to quit smoking. I quit the chantix earlier than expected due to shortness of breath that was severe enough to scare me. Now its been many months since i took it but I started noticing that i was urinating every 3 hours at night and it began when i took chantix and hasn't ended......and now i can add flank pain to that.....pain above the waist and to the right side of the spine. I can now add fatigue to that as lately ive noticed i go to the gym , eat, come home and nap. Energy decline.