Hi,
I've quit many times, and once I even made it for three years! I think my problem in the past was living with a smoker, which made it too easy to try light up again....
Anyway, I wanted to let you know that the mental obsession to smoke will start to lesson as time goes by, although the amount of time differs for everyone. You will even discover that you can actually go a whole day, week, or month without giving cigarettes much thought! After all, you will find much more intersting things in life to focus on.
I found that even when I was smoking, I was obsessing about when I could get my next cig break, etc. I was obsessing about whether I had enough cigs to last me, how long they would last me, enough money to buy more, getting in that last smoke before entering a non-smoking place, etc. So when you attempt to quit, it's just the addiction's way of keeping you obsessing about the cigarettes. It will diminish and be beatable. Best of luck.