Alcohol is the most abused drug in America by a wide margin. In 2023, 134.7 million people aged 12 or older reported drinking in the past month, making it more widely used than all illicit substances combined. While the opioid crisis dominates headlines because of its death toll, alcohol remains the substance that affects the most people across every demographic.
How Alcohol Compares to Other Substances
The 2023 National Survey on Drug Use and Health, conducted by SAMHSA, provides a clear picture of substance use across the country. Among people aged 12 and older who used any substance in the past month, the breakdown looks like this:
- Alcohol: 134.7 million people (47.5% of the population)
- Tobacco products: 49.9 million (17.6%)
- Marijuana: 43.6 million (16.8%)
- Nicotine vaping: 26.6 million (9.4%)
- Hallucinogens: 2.6 million
In total, 167.2 million Americans, roughly 59% of the population aged 12 or older, used at least one of these substances in the past month. Alcohol alone accounts for the largest share of that number, outpacing marijuana by more than three to one.
Marijuana Is the Most Used Illicit Drug
If you’re specifically asking about illicit drugs, marijuana holds the top spot at 43.6 million monthly users. Among young adults aged 19 to 30, the numbers are striking: 42.4% reported using cannabis in the past year, with the highest rates among 23- and 24-year-olds, where nearly half (45.6%) had used it recently. About one in ten young adults uses cannabis daily, defined as 20 or more times per month.
That level of use comes with a real dependency risk. The CDC estimates that roughly 3 in 10 people who use cannabis develop cannabis use disorder, a pattern of use that becomes difficult to control even when it causes problems in daily life. With over 43 million monthly users, that translates to millions of Americans who may struggle to cut back.
Vaping cannabis has also grown rapidly. About 22% of young adults vaped cannabis in the past year, with the highest rates among 19- and 20-year-olds.
Opioids Cause the Most Deaths
The distinction between “most abused” and “most deadly” matters enormously. Synthetic opioids, primarily fentanyl and its chemical relatives, killed 72,776 people in 2023. That figure dwarfs the death toll of any other single drug category. To put it in perspective, fentanyl-related overdose deaths alone exceed the number of Americans who die in car accidents each year.
There is some encouraging movement. Between 2023 and 2024, overdose deaths involving synthetic opioids dropped 35.6%, falling to 47,735 deaths. That’s the largest single-year decline on record for this category. The reasons are complex, involving wider availability of the overdose reversal medication naloxone, shifts in the drug supply, and expanded treatment access. Still, nearly 48,000 deaths in a single year remains a crisis by any measure.
Xylazine in the Drug Supply
One complicating factor in the opioid crisis is the growing presence of xylazine, a veterinary sedative, in the illicit drug supply. From 2019 to 2022, xylazine detection more than doubled across 30 states based on drug seizure data. The percentage of fentanyl-related overdose deaths where xylazine was also detected rose from 2.9% in January 2019 to 10.9% by mid-2022.
Surprisingly, research so far hasn’t shown that xylazine makes overdoses more lethal. People who overdosed with both fentanyl and xylazine in their systems were no more likely to die than those who overdosed on opioids alone. They were actually more likely to still have a pulse when emergency responders arrived. The bigger concern with xylazine is the severe skin wounds it causes at injection sites, which can lead to serious infections and tissue damage that’s difficult to treat.
Prescription Drug Misuse
Prescription drug misuse has actually been declining. Among young adults, nonmedical use of any prescription drug hit a record low of 7.0% in 2023. That’s a meaningful shift from a decade ago, when prescription painkillers were fueling the early stages of the opioid epidemic.
Prescription stimulants are an exception to this downward trend. About 14.5% of college students report misusing prescription stimulants, typically medications prescribed for ADHD. These are often used to enhance focus during exams or manage heavy workloads, a pattern that carries real risks of dependency and cardiovascular problems.
How Substance Abuse Changes the Brain
The reason any of these substances become so difficult to quit comes down to what they do to the brain’s reward system. Drugs and alcohol flood the brain with feel-good signals at levels far beyond what natural experiences produce. Over time, the brain compensates by dialing down its own production of those signals and becoming less sensitive to them. This is tolerance: needing more of a substance to feel the same effect.
The deeper consequence is that everyday pleasures, food, socializing, hobbies, stop feeling rewarding. The brain has recalibrated around the artificial stimulus, making the person increasingly dependent on the substance just to feel normal. This isn’t a failure of willpower. It’s a physical restructuring of brain chemistry that can take months or years to reverse, even after someone stops using.
The Economic Cost
Substance use disorder cost the U.S. an estimated $92.65 billion in lost productivity alone in 2023. That figure only captures work-related losses: $45.25 billion from people unable to work at all, $25.65 billion from missed workdays, $12.06 billion from reduced performance while on the job, and $9.68 billion from lost household productivity. It doesn’t include healthcare costs, law enforcement spending, or the toll on families and communities, which push the total economic burden far higher.
Who Is Most Affected
Young adults bear a disproportionate share of substance use. Among 19- to 30-year-olds, 83.9% drank alcohol in the past year, with binge drinking peaking between ages 21 and 30 at roughly 28 to 30%. Cannabis use is highest in the early-to-mid twenties. Cocaine use, while far less common overall, peaks around ages 29 to 30 at 8.3%.
Nicotine use is also concentrated in young adulthood. Nearly half of 25- and 26-year-olds used some form of nicotine in the past year, whether cigarettes, vaping products, or other tobacco. Nicotine vaping is most popular among 19- to 22-year-olds, with about 30% reporting past-year use. These patterns reflect a period of life where experimentation is common, social environments often encourage substance use, and the long-term consequences can feel abstract.