First you truly have to "Want" to quit, not be pushed into it, you have to WANT it for whatever reason.
Once that is settled, taper off, get down to about 1/3 pack a day and its doable.
There are aids that may help to varying degrees. But the deciding factor is going to be your willpower.
Accept it, look it square in the eye, and ask it. Whos the boss, you or the monkey on your back?
Then do what you have to do, or not.