I smoked for 25yrs and it was hard to quit and took several attempts. But the only attempt that really worked was to put it in 'past tense'. In other words I was no longer 'trying' to quit; it was 'I quit'. 'I use to smoke'; 'I'm glad I quit'. And it was only then that my mind WAS made up that 'I am no longer a smoker. No cigs for just in case or just cutting down, no lighters or such. 'I was a thing of the past'.
I would not make light of it or say that its easy. But the only way I know that works is to be done with it. And yes I got bitchy and was hard to live to the point that My wife brought me a pack and said, "here, start smoking and stop bitching.
Do it for your self, do it for your kids, do it for a new car, but just do it. you will be glad.
And prayer helps, too.