You can do it.
I was so, so addicted to nicotine, and smoked a half a pack to a pack a day (sometimes more if I was partying) for 4 ish years.

I finally decided I was going to quit in University and I did. It was tough, and I slipped up a couple times at the beginning when I was stressed, but here I am almost 4 years later smoke-free.

When you get the urge, going for a walk helps. Sipping cool water helps.

I still get cravings a lot of the time. I'm hoping that will end soon.