Addictions never completely go away but it does get easier. NOT in a linear fashion, there will be tough times, sometimes even after months or years. Overall easier though. Just be ready to fight like hell so you do not lose a battle like some of us have.
Let me tell you what happens if you decide to pick the smoking habit back up, I know this from experience. I did so after having quit for over a year.
First, you give in and buy a pack and feel something isn't right.
Next, you light up and toke the cancer stick as if you never did quit, unlike the first one you ever smoked in your life when your lungs flinched.
You get this weird "high" from it, meanwhile feeling tons of guilt. You pledge to never smoke another. This cycle repeats several times.
In about a week or two, you realize the old habit is back. Meanwhile, you notice you have less money than you normally did as a quitter. The smell of your habit starts offending you. And by now, that little buzz you got at first just doesn't happen anymore.
After a couple months, the "Dry cough" comes back. Sometimes when trying to sleep, you have to cough a certain way so your breath doesn't wheeze. You start to hope that certain people don't learn of your relapse.
Let us not forget the extra filth involved. Cigarette ash and butts, empty packs, having to buy lighters/matches, and of course the ever-present worry about the possible fire hazard.
You start to eventually think, "What if this does shorten my life?" If you are over 40 like I am, it is not a pleasant thought when you realize you are probably more than 1/2 way to the grave and do you really want to speed it up any more?
Honestly, even though a quitter THINKS there will be some awesome feeling of smoking, it really doesn't do anything good. Where is that "pleasure"? There just isn't any.
Then you have to fight like hell to quit again. Or like Johnny 5's signature - "If you have just one you will be right back where you started, and where you started was desperately wishing you were where you are right now."
Do not come back to this side of the habit. It sucks, it plain sucks. You are not missing anything, I promise.