Well, number one - Congratulations on your graduation!
Number two - congratulations on making an effort to improve your health! Breaking any habit is hard, but smoking seems to be particularly difficult. I just want to give you some encouragement. You can do this! Every time you want a cigarette, just stop whatever you are doing and take a couple of loooooong, slow deep breaths. Once you get in the habit of doing that, you will realize how much better it feels to inhale nice clean air, rather than cigarette smoke.
It is going to be hard - don't give up and don't beat yourself up about it. Check out the resources available on the internet. Find something to do with your hands. Heck, download a game onto your cell phone and when you find yourself needing to take a break, play a game or two of solitaire and do that deep breathing!!
Just keep telling yourself that you are a former smoker and eventually you will be!
Good Luck!!