I didn't see this post earlier but here's my story anyway.
I am 75 and started to smoke at age 8. Once in a while my buddy from the neighborhood would sneak a pack of his parents cigs.
They were chain smokers and never missed a pack here and there.
I started regularly at about 12 years old. Bought my own and smoked 'em.
At 16 I was allowed to smoke by my parents. From there I smoked 1-2 packs a day until I had an experience with a close friends drug addiction. He had finally hit bottom and asked for help. I helped get him into a good rehab facility and he got clean. He's still clean almost twenty years later.
As to my smoking, I tried many times (too many to count) Gum, gradual tapering off and cold turkey. Over a couple of months I would get down to two a day. Easy. Easy because I new tomorrow morning or tonight I could have another. Never could get to zero.
My own self esteem got me to quit. "Do I have the will power to do this?" I asked myself. Yes. I had to prove to myself I could do it. After all, my friend had quit crack and all the rest. Well it has been eighteen years now and I still get the urge now and then but it only lasts a few seconds. I don't want to think of myself as weak.
If you really want to quit it is not impossible. But you really have to want to do it.