Yes, students should not be doing illegal drugs. It's illegal and not right.
I'm a Junior in High School and I live in an area where Marijuana is a big problem. Most students have done it at least once, some do it regularly. It's become a thing where, if you haven't tried it (me for example) you're an outcast and a loser because you didn't do something illegal. It's a social thing which isn't right. Now I feel bad for following the law.
It can be distracting from their education and homework. A school should want their students to do well and graduate.