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Students walk to and from classes on the campus of the University of Colorado, in Boulder, Colo., Monday April 20, 2015. The University of Colorado is open to the public on this 4/20 marijuana holiday for the first time in three years. The university has blocked public access in recent years in an effort to snuff mass smokeouts to mark the unofficial marijuana celebration. (AP Photo/Brennan Linsley)

Students walk to and from classes on the campus of the University of Colorado, in Boulder, Colo., Monday April 20, 2015. The University of Colorado is open to the public on this 4/20 marijuana holiday for the first time in three years. The university has blocked public access in recent years in an effort to snuff mass smokeouts to mark the unofficial marijuana celebration. (AP Photo/Brennan Linsley)

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