I fully quit when I was 25. I crushed up the half pack I had in my pocket and chucked them in the trash at a gas station I had stopped in to....buy another pack. Its been almost 10 years now, and in my experience, once I made it 5 months without cigs, it was easier to just never have them again. They dont get you high, as you already said, so what REALLY is the motivation? They really dont taste good (that is truth, and once nicotine leaves your system, you will see this for yourself), they are very expensive, and they make you smell completely disgusting.
RIght before I finally quit, my doctor asked me at a checkup if I smoked. I said yes, then he closed the door and asked "no, do you smoke (and made the universal joint to lips sign). I said yes again, and he said "PICK ONE". He said to quit one of those habits....one does do something for you, the other just kills you. So pick one, and you'll be much healthier for it. I chose to bag the cancer sticks. Seen in that light, it was amazingly easy to never go back to that evil.