6 days before graduation and got caught smoking cigarettes at school overnighter?

Okay guy's I'm in complete shock right now. Last night i went a band overnighter and had a cigarette at 4am, it ends at 6; i had a pack and lighter on me, and was headed home after my smoke. Well, i finished and was about to walk home until my band teacher and a istant caught me, as i was walking off, he asked "what the hell was i doing and i said walking home", then he said he smelt cigarettes then he took me to the office and wrote me up and took the pack and lighter, he said it was the WORST thing i've ever done. Since graduation is in 5 days, and evidently i'll be talking to a school admin on monday. Will i graduate or be able to walk? Will my parents be notified? I'm 18 and have already had several problems with my parents in the past, but the last few months have been nice....So what now? I RARELY if ever smoke. The pack was given to me from my friend and i honestly don't like them, but since i was on school property heading home i don't think that will matter...So what's gunna happen..?