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The authors would like to submit a correction to Table ​Table22 of the above article. The proportion of past-year users that are college graduates should be listed as 22 percent. The corrected table is printed here.    Table 2  Past-year use, number of drug-related arrests, and number of monthly purchases by education level and racial-ethnic group, 2011 NSDUH.

Erratum: Statistics on Cannabis Users Skew Perceptions of Cannabis Use