This National Academies Press report is a peer-reviewed federal research study analyzing the social, economic, and behavioral drivers of illegal drug demand in the United States. It is widely credible due to its expert committee authorship, though it predates the fentanyl crisis and does not address fentanyl.

Drug Use Spreads through Epidemic-Like Social Processes

Illegal drug markets must be understood using an economic supply-and-demand framework

Supply-side enforcement alone has limited long-term effectiveness

Future policy should emphasize public-health and demand-reduction approaches

Conclusion — Understanding the Demand for Illegal Drugs

Understanding the Demand for Illegal Drugs demonstrates that illegal drug markets persist not simply because drugs are available, but because demand is sustained through social diffusion, addiction, economic incentives, and insufficient treatment access. The report shows that enforcement alone cannot eliminate drug use; lasting reductions require policies that treat substance use as a public-health issue, expand treatment, and better understand the social dynamics that drive initiation and dependence. Its central lesson is clear: drug policy becomes effective only when it focuses on reducing the number of people who need drugs, not merely the number of drugs that exist.

To understand drugs is to understand people—how behavior spreads, how addiction persists, and how policy must address human demand, not only supply.