About 39.5 million people worldwide lived with a drug use disorder in 2021, representing roughly 0.5% of the global population. That number sits within a much larger pool: approximately 296 million people (5.8% of the global population aged 15 to 64) used drugs at least once that year. The gap between those two figures matters. Most people who try drugs don’t develop an addiction, but tens of millions do, and the vast majority of them never receive effective treatment.
How the Numbers Break Down by Substance
Of the 296 million people who used drugs in 2021, about 60 million used opioids, making them one of the most widely consumed drug classes globally. Opioids also carry a disproportionate share of harm: overdose, disability, and death rates far exceed those of most other substances.
Cannabis use disorder is the single most common drug use disorder worldwide, with an estimated 271 cases per 100,000 people in 2023. That’s partly because cannabis is the most widely used illicit drug on the planet, so even a modest percentage developing problems translates to large absolute numbers. Amphetamine, cocaine, and opioid use disorders follow, each with distinct regional patterns.
Who Is Most Affected
Men are more likely than women to use nearly all types of illicit drugs, and drug use is more likely to lead to emergency visits or overdose deaths for men. Yet women who do use drugs are just as likely as men to develop a substance use disorder. The difference is one of exposure rather than vulnerability: fewer women start using, but those who do face comparable risks of addiction.
Young people carry a notable share of the burden. In the United States, 15% of high school students reported having tried cocaine, inhalants, heroin, methamphetamines, hallucinogens, or ecstasy at least once, and 14% reported misusing prescription opioids. Globally, drug use among people aged 10 to 24 accounted for over 16,000 deaths and 4.1 million years of healthy life lost in 2019 alone.
Where Addiction Rates Are Highest
Drug use disorders are not evenly distributed across the globe. The highest rate of new cases appears in high-income North America, at roughly 520 per 100,000 people, driven largely by the opioid crisis in the United States and Canada. Western Europe ranks second at about 302 per 100,000, followed by Eastern Europe at 276 per 100,000.
When measured by overall health impact rather than new diagnoses, the picture shifts. Central Asia tops the list, with the highest rate of disability and early death from drug use disorders. Eastern Europe and Oceania follow. These regions face a combination of limited treatment infrastructure, high rates of injection drug use, and related infections like HIV and hepatitis C that amplify the damage addiction causes. By contrast, high-income Asia Pacific countries report the lowest health burden from drug use disorders globally.
The Treatment Gap
Perhaps the most striking number in all of this is how few people get help. Only about 7 out of every 100 people with a mental health or substance use disorder worldwide receive effective treatment. The barriers stack up at every stage: fewer than half of people who meet the criteria for a disorder even recognize they need treatment. Among those who do recognize the need, only about one in three actually seeks help from the medical system. Stigma, cost, lack of available services, and criminalization of drug use all play a role.
This means that for tens of millions of people living with drug addiction right now, treatment is either unavailable, unaffordable, or something they don’t yet see as an option. The gap is widest in low- and middle-income countries, but it exists everywhere.
The Economic Cost
Addiction’s financial toll is enormous even when measured in a single country. In the United States, the opioid epidemic alone cost an estimated $1.5 trillion in 2020, a 37% increase from just three years earlier. That figure includes healthcare spending, lost productivity, criminal justice costs, and the economic value of lives lost to overdose.
No comparable global estimate exists, but given that the U.S. accounts for only a fraction of the world’s drug use disorders, the worldwide cost is almost certainly several trillion dollars annually. Those costs fall not only on the people who are addicted but on families, employers, and public health systems that absorb the consequences of untreated addiction at scale.
Putting the Numbers in Context
A 0.5% global addiction rate can sound small in the abstract, but 39.5 million people is roughly the population of Canada. And that figure likely undercounts the true number, since it relies on surveys and diagnostic criteria that miss people who hide their use, live in regions with poor data collection, or don’t interact with healthcare systems at all. The actual prevalence of addiction worldwide is almost certainly higher than any official estimate captures.
The 5.8% figure for any drug use is also worth sitting with. It means that nearly 1 in 17 working-age adults on the planet used an illicit drug in a single year. Most of those people will not develop a disorder, but the line between recreational use and addiction is not always obvious from the inside, and crossing it rarely feels like a choice in real time.