Objective: This study evaluates the effectiveness of a smoke- and tobacco-free campus policy by examining the volume, density, and location of discarded cigarette butts before and after the implementation of the policy. Participants: Student, staff, and faculty volunteers collected and recorded the location of discarded cigarette butts in April 2017 and October 2018. Methods: The Smoke and Tobacco Free Environment policy was effective September 1, 2017. A campus-wide collection of cigarette butts was conducted 5 months before, and 13 months after it came into effect. Results: The number of cigarette butts on campus decreased after policy implementation, especially in areas with formal enforcement. There was evidence of displacement of smoking behavior from the campus center to its periphery where parking lots and staff buildings are located. Conclusions: Formal enforcement is key to increasing the efficacy of the policy. Interventions should be directed to the locations where smoking behavior is concentrated.