In each year, the prevalence of marijuana use was significantly higher in states with MML, and perceived riskiness of marijuana use was significantly lower (Table 1). Longitudinal analyses controlling for a statistically significant decreasing trend in marijuana use from 2002–2008 (β= −.35, t-value = −15.9, p-value <.0001) found that among the 8 states that passed MML since 2004, the prevalence of use in the years prior to passing laws was 8.88%, not significantly different (p=0.25) than states that had already passed laws (8.58%), but significantly higher than the prevalence for states without MML by 2011 (6.94%, p<.0001). Perceived riskiness of marijuana use in states in the years prior to passing MML was 30.5%, not significantly different than states that already passed laws (30.9%, p=0.58) but significantly lower than states without MML (35.7%, p<.0001).
