Illegal Heroin use in the United States

The black market in heroin in the United States uses up to 5 percent of the world’s total illicit opium supply, with most of it being trafficked from Mexico and Colombia.

Source: Jonathan P. Caulkins, Jonathan D. Kulick, and Mark A.R. Kleiman, “Think Again: The Afghan Drug Trade,” Foreign Policy, April 1, 2011.