Your link doesn't show that habitual use or selling is higher in white populations, just that white people have tried drugs more.
I'm not trying to say the incarceration rate isn't skewed, just that the report you linked just says have used drugs at a higher percentage, not continue to use. If you used drugs at any time, you were counted in that statistic, but that doesn't mean that drug users are higher in any race.
You think everybody arrested for drug use is a habitual user? I guarantee many people (especially Black people) who have been arrested for possession were not addicts in any way, and may have only tried the substance once or twice previously.