In this paper we examine the relationship between marijuana use and human capital formation by examining performance on standardized tests among a nationally representative sample of youths from the National Education Longitudinal Survey. We find that much of the negative association between cross-sectional measures of marijuana use and cognitive ability appears to be attenuated by individual differences in school attachment and general deviance. However, difference-indifference estimates examining changes in test scores across 10th and 12th grade reveal that marijuana use remains statistically associated with a 15% reduction in performance on standardized math tests.
Pacula, Rosalie Liccardo, Jeanne S. Ringel, and Karen E. Ross, Does Marijuana Use Impair Human Capital Formation?. Santa Monica, CA: RAND Corporation, 2004. https://www.rand.org/pubs/working_papers/WR121.html.
Pacula, Rosalie Liccardo, Jeanne S. Ringel, and Karen E. Ross, Does Marijuana Use Impair Human Capital Formation?, Santa Monica, Calif.: RAND Corporation, WR-121, 2004. As of October 26, 2021: https://www.rand.org/pubs/working_papers/WR121.html