> You don't seem to have responded to my point at all, which is that blacks have a higher rate of reported usage within the last week.
That's completely counter to the results of both the MTF and NSDUH. Since 1975, with the exception of Native Americans, whites consistently have slightly higher usage rates of drugs than any other racial demographic, although the overall drug usage rates are roughly comparable. For example:
> For a number of years, 12th-grade African-American students reported lifetime, annual, 30-day, and daily prevalence rates for nearly all drugs that were lower—sometimes dramatically so—than those for White or Hispanic 12th graders. That is less true [in 2014], with rates of drug use among African Americans more similar to the other groups[0]
The reason for the discrepancy is that you're citing statistics from the BJS about drug users. That's quite different from usage rates of drugs within the general population.
Finally, you are quite literally begging the question[1] by citing the 1981 analysis (which is itself a rather contested one). Even if we take that data at face value, it concludes that black men understate the crimes they commit, and does so by comparing this to arrest records. The whole point is that arrest records provide a skewed perspective of drug usage for black men (and women), because they are far more likely to be arrested for the behaviors they do.
[0] http://monitoringthefuture.org/pubs/monographs/mtf-vol1_2014...
[1] Yes, begging the question, not raising the question.