Well - I have not touched one in 27 days - and to be honest - I feel both good - for giving up and horrible - all I want to do is sleep!!!
I am on Champix - not bad stuff - but for me it is constantly a mental fight. I did not want to quit - but my wife of 43 years got told she had to quit because of moderate Emphysema in both lungs - so I said I would quit if she did. The irony of it is she is still smoking - about 2 or 3 a day (her reward).
For me I am sort of holding my end of the bargain - and admittedly getting the rewards (I think) - but I am just taking this one day at a time (I am nearly 65 years old smoking since 14 (would you believe under doctors advice - menthol for sinus)..so that is my story.