I would suggest Chantix are really very effective,you have to finish three months dosage and actually followed directions the whole time as prescribed by your doctor. Obviously there are nausea, trouble sleeping or sometimes you get very tired, some dreams and some shortness of breath at weird times also occurs. But, You have to follow it, or it will not work.
If you are not successful at quitting smoking with Chantix, then Nicotine replacement medications and other medications are common alternatives. Some of this options include:
Nicotine patches, such as NicoDerm CQ or Nicotrol
Nicotine gum, including Nicorelief or Nicorette
Nicotine lozenges (Commit)
Nicotine inhaler (Nicotrol Inhaler), available with a prescription only
Nicotine nasal spray (Nicotrol NS), available with a prescription only.
Using nicotine replacements defeats the object. You are a drug addict addicted to nicotine, just like I was! If champix gives you side effects you don't like (i had nothing) then try reading allen carrs book "the easy way to stop smoking". If you are addicted to lets say heroin and you want to get clean, whats the use of taking heroin replacements instead of shooting up?
Taking nicotine via smoke or eating or spray or whatever way, you are still letting a very toxic "pesticide" enter your body!