My hubby has been taking champix tablets for 10 days to give up his 25 a day smoking habit (smoked for nearly 20yrs). He has cut out the cigarettes completely in the last day or so, and is complaining of extreme tiredness. At the same time he has more headaches (not affecting his vision)and just feels a bit odd-is this the effect of not having nicotine?? It is wonderful that he is giving up so I want to encourage him to continue, but he feels weird. Anyone else had this experience, with or without champix?