duhrickjames had it right.

Schools are more like prisons now.

Just get clean and stay clean. Expect to have to take a drug test. Even if you don't, you just saved money from not smoking for a few weeks. Heh.

If your parents are willing to back you up, then tell the school to FUCK OFF if they ask for a drug test. But, only if your folks are gonna back you up. Or you can retain an attorney that you pay for yourself.

good luck!