Been 31 years since I gave up a 3 1/2 pack a day habit. I have little doubt that I would be not be alive today had I not done so.
The only way to quit is to quit.
And the only effective motivation to quit is that you truly want to be a non smoker instead of a smoker.
You only have to give up one cigarette to quit, the one you are wanting right now. Just don't smoke it and you'll find the intense craving for it leaves after a short while. When it returns, just give up that one cigarette again and you'll start noticing the periods of craving become farther between and increasingly less intense (especially after about the first 3 days). You only have to deal with the cigarette you are wanting right now, not every one you will ever want all at once.
Eventually you'll realize that you no longer have any trouble resisting them, and then that you have become a non smoker instead of a smoker.
And you only gave up one cigarette to do it.
It does help to develop other behaviors to fill whatever personal need you were filling with a cigarette if you want to stay a non smoker for the rest of your life, much more of a challenge than actually quitting in my experience since you have to identify exactly what you were using those things for in the first place (both emotionally and psychologically).