I would like to help everyone out here because its important! You see Chantix makes you Hypothyroid this is because it (pituitory glands) blocks hormones from your Thyroid turning off recepticals to that area. So guess what you could drink water and still gain weight, dirty little secret its not you and in fact that is something you don't want messed with because it can become an issue were as your Thyroid stays turned off and you remain in a Hypothyroid state witch in turn follows your Adrenals and that is when you get excited or lets say spooked your heart starts pounding and as they say your adrenal goes into overtime. Long and short of it all is you have to have will power without the costly drug costing a lot and then causing other problems.
My husband went through this and I knew why and giving information that I know that can and will give you understanding! I know from a different but relevant experience!