i went to my local doctor to get help with quitting smoke and she offered me a tablet called champix it was working fine as 1st starting on the 0.5 mg my smokes would taste bad and make me feel sick then i got to my 2nd week with the 2mg tablets and this is where my problem would start i was still smoking at this point and 3 days before i was done on my 2nd week i was having a smoke i passed out and woke up with serous pain thinking it was only a flu i let it go it has been 2 weeks now and my body is fully in pain and i am wrose off then what i was before i tried to stop smoking i get really bad pains in my back legs and body i can not keep fluid down or even food i get really sick and can passout i can not even sleep anymore due to the pain or enjoy life as it ones was now this was my experience on this tablet but just take it as a warning do not go on the tablet if u have any problems u may think will mess with it coz u will suffer as i have and i do not know when this pain will ever go away if it will