Younger guys, you may feel like quitting is something you can deal with later, but every smoker is affected seriously, whether it's apparent to you now or not.
A friend of mine in his late 20's had to take a physical for a new job that included measuring his lung function. He was down to 4 cigarattes a day then, and he measured 25% of normal.
Some people have an easier time quitting than they expect. For others it's hard.
Even if you don't make it the first time, keep trying. Every time you try and cave in, you actually are getting a little closer.
That 'failure' is really not, and can make you more determined to try again.
For me, what worked was going to 'medium','light', then 'extra light'.
Good luck, and save those lungs.