The city of Chicago provides students with access to any drug they could possibly want, but most students seem to stick to the occasional use of marijuana. There is heavier stuff used by students, but if you don’t want to see it, you really don’t have to because the heavy drug scene pretty much stays under wraps. In addition to marijuana, Adderall is pretty common during midterms and finals.
There is little to no pressure associated with using drugs, and the diverse student body leaves room for a lot of people who don't associate themselves with drugs. The University, and Chicago itself, seems to take the selling of drugs much more seriously than the use of them, but the No. 1 reason a student would get kicked out of housing is for possessing drugs on campus.