I gave up 3/4 years ago.
Get rid of all your lighters, ash trays etc, you won't be needing those and join up with a group like quitnet. They send you daily, weekly, monthly emails to tell you how many you've not smoked, how much money you've saved and how much you've extended your life by. Really encouraging stuff.
Day by day until you reach a couple of weeks, then it's easy.
I used that Zyban stuff, worked for me.