A nick? That doesn't seem like too much. It seems to me like you just picked a bad time to smoke. Right before school? Come on dude that's a waste of weed, you can't really enjoy it at school because you have to act sober so you don't get caught. Plus the paranoia, I can't image it.

I would say don't smoke before school, smoke when you have alot of time on your hands to just chill and do stuff that you want. The best time is in the evening/night so you can just pass out after you start comming down. The very best is the weekend cuz you can be burnt and out of it the next day with no worries.

The worst time is probably before/during school when you have to actaully have to think and learn and where there are a shitload of authorities that can easily catch you. Just my 2 cents.