Varenicline
"Magical Product!! I didn't expect such results. I used it for 3  weeks, didn't complete the 4th week and I am not taking any dosage now since 2 weeks. Smoked about 2 during that time and the taste was disgusting. Side effects are very minimal. Highly recommended for people who want to quit. 

The urge to smoke vanishes within days, but the habit remains. Like I used to go for smoking at work every hour. Now after every hour I stand up as part of my habit. But smoking is what I dislike. If you want to quit you should give it a try."