Four days ago I started taking Chantix, to help me quit smoking. I have tried everything to quit before with little to no results. From almost the first day on Chantix, the cravings were not as bad as they usually are. Yesterday, was my third day and I only smoked 15 cigarettes! One thing that I have noticed is, you really must eat before you take the Chantix otherwise it will make you nausanauseous. The other thing that I noticed is that it makes me a little sleepy.