Varenicline
"I'm now on week 7 of my champix 
I've stopped for over 5 weeks now I've felt good up until this week where I have been agitated nausea and headaches.
I'm going to cut down to one tablet a day as its after I take my night tablet I get these symptoms.
I'm thrilled I'm now a non smoker and the champix has definitely helped but I think  a lot is down to cutting out habits changing your daily routine which I have done.
Good luck to everyone if I can do it anyone can."