Just as in high school, there will be people at Kentucky who are interested in drugs and not in school. They will, however, probably be in college for the better part of a decade. Drugs are available depending on the sort of people you socialize with. For the most part, there are so many activities that don't involve drugs, you may never notice them.
There is no peer pressure involved with the drug scene on campus, but you may want to keep a close eye on your drink at parties, as people have been known to wake up the next morning not knowing where they are. Use good judgment and watch who you hang out with.