"Although residents of disadvantaged neighborhoods, neighborhoods with high concentrations of minorities, and neighborhoods with high population densities reported much higher levels of visible drug sales, they reported only slightly higher levels of drug use, along with somewhat higher levels of drug dependency. This finding indicates that conflating drug sales with use, so that poor and minority areas are assumed to be the focus of the problem of drug use, is plainly wrong. The finding is based on the data collected across 41 sites, including city and suburban (but not rural) areas in all regions."

Source

Saxe, Leonard, PhD, Charles Kadushin, PhD, Andrew Beveridge, PhD, et al., "The Visibility of Illicit Drugs: Implications for Community-Based Drug Control Strategies," American Journal of Public Health (Washington, DC: American Public Health Association, Dec. 2001), Vol. 91, No. 12, p. 1991.
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