BYU is a private university owned by The Church of Jesus Christ of Latter-day Saints, whose general membership has committed to not using alcohol, tobacco, coffee, or tea. Accordingly, no smoking or drinking of alcohol, coffee, or tea is permitted on the BYU campus, though other caffeinated beverages are allowed.

Can you go to BYU and not be Mormon?

At Brigham Young University, the Provo, Utah-based Mormon superschool that boasts a network of satellite campuses, impressive national rankings, and educates many LDS members, students are free to enroll as members of any faith, or even of none. The result is that they are not eligible to attend BYU.”