The students seem to agree that while drugs are present on campus, they're not going to be in your face. Tobacco use is relatively common, and hookahs are very popular. Most people aren't adverse to responsible use of lighter recreational substances like alcohol and marijuana. Both are readily consumed in the dorms, campus parties, and on back campus. If you're not interested in taking part, you won't be pressured. Wellness Lifestyle halls are available for students who choose to abstain and wish to live in an environment with others who also choose a drug-free lifestyle. The College also makes a concerted effort to offer fun substance-free activities every Friday and Saturday night. Harder drugs are present on campus but are not visible in the same way. Unless you're out looking, you probably won't run across them. The area around campus is pretty straight-laced, too; don't expect to come across too much drug use in town.
Due to a somewhat lax security force, students don't get too bent out of shape trying to hide alcohol or marijuana use. Ultimately, however, most students aren't using during weekdays and demonstrate some sense of responsibility on weekends. If being around drug use truly bothers you, try to avoid EH and especially Barrett. Some of these kids get into the "work hard, party hard" scene, sometimes resorting to drugs like Adderall to pull some drug-assisted all-nighters.