I quit smoking two weeks ago on chantix. I have had no side effects from it. But I do not take it twice a day like they say I only take it in the morning. I also started vaping to help with the wanting to puff on something. I vape 0mg so no nicotine for me. I am thinking about going off the chantix but am waiting till I go back to the drs to get his ok. He was hesitant for me to go on it and wanted me to just quit cold turkey but I don't think I could of done it.