First few times I quit up to 3 months, on my own. (few like 3-4 times total)
After all that time, I realized this won't go easy at all.
Next time I made a peak of 7 months. Nothing happened, just realized: here we go again, back!
Next 2 times I knew there is no success in this journey if I go by myself. I became mature a bit, 25+ should be years when religion start coming to your mind.
Somewhere at age of 26-27 I pray to my God, and his name is Jesus, to help me as I was very aware that another FALL will come. No matter what I do (this is my case only)
Together, with God, I started another battle, and I failed more 2 times, had 2 new peaks of 8 and 9 months. But I still knew I can make it!
Today I am Free for 1 year 8 months, and I hate smoke, and I still pray to Jesus to keep me out of it, because you can always fall back into it.
You can basically stop smoking in 5 days period, but the issue is not into quitting. Spiritual world is suggestion world, and devil is ready with numerous tactics. (he just help you decide, not forcing you at all, that's the beauty, you done it all yourself and nobody else is guilty)
A lot of em can be applied on you, so he can play with you however he wants. Let you feel safe, strong, crush you like a flower, you have to pray and show to God that you are ready to stop even if you're not!