Treatable? Sure. Can one be fully "cured" from it is the question? I can almost say for sure that it is not possibly. To understand this you have to be an ex smoker. Surely we can not generalize as each 'drug' is addictive in a different way. I used the word drug but I'm implying everything, including coffee and whatnot. In the case of quitting smoking, it is fine until there are no smokers around. However, when you see someone inhale that first puff in your vicinity you get reminded of how it feels and you want to feel it. There's a particular, hard to explain, feeling with smoking (sometimes). Smokers should understand.
This is partially true. HOWEVER. As someone who quit smoking Tobacco (maybe not everything else lol), I can say that when I do smell tobacco, it really smells badly. I am often wondering how I smelled like that so much and felt badly for making my old co-workers deal with it. Smoking cigarettes is not just a waste of money, it's just fucking gross, IMO. Wish I could take back 20 years of smoking now!