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Polysubstance use is no longer the exception—it’s the clearest expression of a single addictive disease.

Most overdoses involve multiple substances—opioids, psychostimulants, Benzos, alcohol, and cannabis.

Substance use before age 18 is strongly associated with a chronic and relapsing polysubstance use disorder.

Addiction medicine is in the midst of a conceptual tectonic shift. Recent work by Director Nora Volkow and National Institute on Drug Abuse (NIDA) colleagues is crystallizing the direction of the change. What clinicians have historically labeled as separate conditions—alcohol use disorder, opioid use disorder, cocaine use disorder—is now better understood as different expressions of one common vulnerability.

These NIDA experts reported nationally-representative data from 92,000 U.S. adults, revealing that polysubstance use is the dominant pattern among individuals with substance use disorders (SUDs). Nearly three-fourths (73%) of stimulant-involved overdose deaths also included opioids.

Large population-level data make these facts difficult to ignore. Polysubstance involvement is not a niche phenomenon confined to obscure cases. Instead, among those with opioid, stimulant, methamphetamine, or hallucinogen use disorders, most have at least one additional substance use disorder, if not several more

If we include nicotine and cannabis—as we should—the picture shifts dramatically. Tobacco dependence is strongly connected to alcohol and other drug use, and cannabis use disorder substantially increases the likelihood of other substance involvement. When these substances are accounted for, most individuals with substance use disorders are using more than one substance. If most patients no longer have one-substance disorder, the longstanding clinical instinct to identify a “primary” substance becomes untenable.

A second finding is the timing of substance exposure. Early initiation, particularly before age 18—is strongly associated with a greater number and severity of substance use disorders later in life. In contrast, individuals delaying initiation until age 21 or later have substantially fewer disorders and dramatically lower rates of moderate-to-severe addiction. Adolescence is a period of maturation in executive control, reward processing, stress regulation, and decision making. Early exposure to psychoactive substances apparently activates a generalized addiction liability that later emerges across multiple substances.

Genetic studies show substantial overlaps in addiction across alcohol, nicotine, cannabis, opioid, and stimulant use disorders. These are overlapping expressions of a common vulnerability determined by reward sensitivity, impulsivity, stress responsivity,........

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