I used to smoke 40 cigs a day. I gave up smoking 13 weeks ago with the aid of Champix. I now cannot walk 100 yards down the road without getting out of breath. I have a horrendous cough. Now I have finished the Champix I don't want a cigarette, but I want to kill someone, cry all the time, smash things in the house, hate my family............. I wish I'd never heard of the NHS quit smoking clinic