I smoked over a pack per day almost every single day for 10 years -- from ages 15 to 25. I quit for a couple of hours or days several times, never more than about five days at a time. I now haven't smoked a cigarette in over 12 years, and I'm pretty confident I never will again. The posters who've already said that the way to quit smoking cigarettes is just to quit smoking cigarettes are correct. When you are ready, you will just stop it. Until you reach that point, it likely won't take because it's a habit and if you're really a committed smoker, it's one you've probably accepted into your persona.
How do you really quit smoking? Make it not a part of who you are. That means stop smoking when you wake up. Stop smoking with your coffee. Stop smoking on the way to work or school. Stop taking breaks all day to smoke. Stop smoking on the way home from work or school. Stop smoking after eating dinner. Stop smoking while drinking. Stop smoking after *******. Stop smoking right before going to bed.
Your day generally will be much the same as when you were smoking. Except you won't be smoking before, during, or after every single thing you do. You'll feel much better, and you'll smell much better. Good luck.