I started smoking also around 15. I quit cold turkey on the day I turned 40, a few moons ago. I had tried a few times in those years but only lasted a few days til that urge overpowered me. Finally I told myself that no little effing paper wrapped tobacco stick was gonna get the best of me. So, like I said, I had set a definate goal and didnt attempt to do anything until that day of my birthday. I smoked the night before I turned 40 right up until midnight, then I told myself its do or die.
Yeah, it was a powerful struggle. Within 3 days I had hemmoroids from the stress and my wife went and bought me some cigarettes, seems I was a lil grouchy

for a bit

But, I had set my goal and was determined to not fail. I toughed it out carrying a pack of cigarettes in my pocket and I dearly wanted to go out to the barn and smoke one, but I knew if I did I had lost.
I smoked a carton a week on average. 15$ a carton at the time, and I smoked Winstons. After the first week, she put the 15 in a jar and said every week I quit she would put the cigarette money in that jar and in a year I could have it if I had still quit. She kept it up for 3 years, and that money bought my r/c planes and hobby stuff. I had even managed to put some of that money away in mutual funds.
Now, I went 10 years without touching a tobacco product at all. I do ocasionally puff on a cigar when I played aces high recently, but I am not addicted to it. I was flat addicted to the cigarettes.
Anyway, thought I would mention maybe putting your smoking habit into a jar and watching that money accumulate. Cigarettes are what now.... 40+ bucks a carton? Thats a lot of cash in the jar in a few months time.