Not directly relevant I know but I stopped smoking almost exactly 48 hours ago and am using Zyban as an aid. Yesterday was OK and I thought nicotine withdrawal was going to be easy but the withdrawal syndrome is just kicking in today. Anxiety, irritable, headache, general feeling of missing something, confusion and lack of concentration. Oh what a lovely three or four weeks to look forward to, but is has to be and will be done.
I hope you don't mind me keeping a diary of this experience.