Started the ANTI SMOKING DRUG champax

Well started the new stop smoking drug on sunday, supposed to keep smoking for the first two weeks then stop. I do hear that some people cant wait the 2 weeks, hopefully i am one of them been on it 3 days found each time i have a ciggy i get a sore head for 5 or tens mins, also weird taste in my mouth, could all be in my mind bit we see in two weeks.