Varenicline
"First tried Champix about a year ago, pretty weird and vivid dreams for a couple of nights but after that all OK. Tend to take second tablet at lunch or early afternoon to lessen any impact on insomnia. Only stopped initially for a few days but cut down to only 4 or 5. I had smoked around 20 a day for 38 years after starting when 12 years old. I kept taking Champix for the next year paying full price as figured the cut down was worth it even though still smoking - the Champix did not seem to affect me or my desire around those 4 or 5 (but if I had more I felt pretty crook). Finally stopped 18 days ago  and pretty confident that is it. i am back on the second lot of PBS subsidised scripts with about 4 months to go and will see them through."