You can do it.

Former cigarette smoker here.

Nate Dog is right, the nicotine is only in your system for a couple days, after that it's all psychological. (btw, a good bike ride takes care of a nic-fit like nobody's business)

Cold turkey is one of the best ways, and while I'm normally against medicines (because they are usually nicotine based, meaning they just prolong your withdrawal symptoms) Chantix is different, because it blocks the receptors, meaning that if you cave and have a cigarette, you're not going to feel it, so it won't as easily send you back into an addiction cycle. But it's perfectly doable without it.

Just remember that you might need to attempt it a few times before it sticks - don't feel bad if you fail the first couple times, attempts are the clearest sign you will succeed in the future.

And if you find that you are not emotionally ready to "give them up for the rest of your life", you might have to play some psychology tricks to keep from getting discouraged.

I would get down and think how I didn't want to say in absolute terms that I would never ever have a cigarette in my hand (I know, it's silly). Then I'd let myself have an occasional cigarette, and it would creep back up. So I had to make the illusion of concessions, but with very strict limits, to keep from getting discouraged. I would make rules like: you can only have a cigarette under very strict circumstances. They are: 1) You have to bum it 2) from someone you don't hang out with regularly 3) No more than twice in a month 4) it has to be a hand rolled cigarette. This way, it felt like I had freedom, without really giving myself room to slip.

Be happy. Addiction has a hard time with happy people.

Good luck.