Does legal marijuana access blunt academic performance in college? It does.

Getting into the weeds: Does legal marijuana access blunt academic performance in college? Adam C. Wright, John M. Krieg. Economic Inquiry, https://doi.org/10.1111/ecin.12743

Abstract: This paper examines the effect of legal access to marijuana on student performance stemming from a voter‐approved initiative legalizing marijuana for those 21 and older in the State of Washington. Using panel data from a medium‐sized public university, we use a within‐student and within‐class estimator to show that legalization reduces students' grades, with an effect size about one‐half the impact of gaining legal access to alcohol. Consistent with how marijuana consumption affects cognitive functioning, we find that students' grades fall furthest in courses that require more quantitative skills. These effects are largely driven by men and low performers. (JEL I23, I18, K32)