Hello!
I have never smoked, so I can't even imagine how hard it is to give that up. And my example might seem flat out ridiculous cause it's no comparison to a smoking addiction. But I used to curse like no other. Man, I was bad. I would curse if I stubbed my toe, if I lost my keys, or even if I merely dropped a piece of paper!! Keep in mind this cursing was building and building for about 5 years, I just didn't have a care in the world what flew out of my mouth. And my road rage? MAN was it bad.
I prayed to God to help me get through this, now I have complete and total control over what I say. A habit like that does not break that easily except for with the power of God. Now I even cringe when I hear cursing!!
Pray to God. He WILL help you if you are serious about quitting and if you put in effort as well. Remember-God will move mountains, IF you bring the shovel!!!
And now, for some friendly and encouraging scripture

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Matthew 19:26
Jesus looked at them and said, "With man this is impossible, but with God all things are possible."