Like most schools, the most popular drug on campus is marijuana. A good number of Willamette students will smoke marijuana, but for the majority that does not smoke, there is no peer pressure to join in. While Willamette students tend to be pretty liberal toward marijuana, it is not visible on campus. Most people who smoke do so in their room or at off-campus houses. Harder drugs—cocaine, meth, and heroine—are very rare on campus, and you have to go searching to find any. The overwhelming majority of Willamette students will graduate without ever seeing any hard drugs.
Willamette is great for students who enjoy recreational use of marijuana, but it's also great for students who do not want to be around drugs. There is a good balance between those two groups. One nice thing about Willamette is that the University provides free substance counseling services for students struggling with substance abuse.