Among past year cannabis non-users overall, perceived great risk of regular cannabis use varied significantly between 2002 and 2012 χ2(10, N = 499,457) = 95.35, p<0.001, and decreased significantly from 2002 to 2012 (56.5% vs. 45.3%, respectively) χ2(1, N = 87,837) = 322.04, p<0.001 (Table 3a). Significant variations in perceived great risk were found for all race/age subgroups, with the exceptions being individuals of Other race/ethnicity between the ages of 26–49 χ2(10, N = 10,329) = 2.35, p=0.015 and age 50+ χ2(10, N = 3,135) = 1.83, p=0.064.
