Youth Cannabis Use in Colorado Is Falling — But the Full Story Is More Complex

The latest edition of the Healthy Kids Colorado Survey (HKCS), published in June 2026, delivers a striking headline: fewer high school students are using cannabis than in previous years. According to the 2025 data, approximately 10 percent of high school students reported cannabis use within the past 30 days. This represents a notable decrease from 13 percent in 2023 and a dramatic drop from 21 percent in 2015, shortly after Colorado launched legal adult-use cannabis sales.

The survey, conducted by the Colorado Department of Public Health and Environment (CDPHE), stands out not only for its findings but also for its scale. More than 134,000 middle and high school students participated in the 2025 edition, making it one of the largest and most comprehensive youth health surveys in the United States.

Due to its size and methodological consistency, the HKCS is widely considered a reliable indicator of behavioral trends among young people, and its results carry significant weight in policy discussions.

Cannabis Use: A Trend That Defied Early Fears

Before cannabis legalization was introduced, critics frequently argued that allowing legal sales for adults would inevitably increase access for minors. The concern was straightforward: if cannabis became easier for adults to obtain, it would also become easier for teenagers to access it indirectly.

However, more than a decade of data from Colorado suggests a different reality. Not only has overall cannabis use among teenagers declined, but their perception of cannabis availability has also shifted. Increasingly, students report that obtaining cannabis is not as easy as it once seemed. At the same time, social attitudes are changing. By 2025, nearly 80 percent of high school students said they disapprove of cannabis use among their peers—a significant increase compared to earlier years.

This shift in perception is important. Public health research consistently shows that when young people believe their peers disapprove of a substance, they are less likely to use it themselves. In this sense, changing social norms may be playing a key role in reducing cannabis use among adolescents.

Regulation Versus the Illegal Market

Supporters of legalization often point to a simple mechanism behind these trends. Licensed cannabis retailers operate under strict regulations, including mandatory age verification. Selling to minors can result in severe penalties, including the loss of a business license. As a result, legal stores have strong incentives to comply with the law and deny access to underage customers.

In contrast, illegal dealers operate without such constraints. They do not check identification and face fewer immediate consequences for selling to minors. According to data from Colorado’s Cannabis Enforcement Division, licensed retailers deny entry to individuals without valid identification in nearly all cases, suggesting that regulated markets may, in practice, limit youth access more effectively than prohibition.

Colorado is not alone in this pattern. Similar observations have been reported in other jurisdictions that have legalized cannabis for adult cannabis use. Studies and evaluations from countries such as Canada and Germany have also failed to confirm early predictions of a surge in youth cannabis consumption following legalization.

Correlation Is Not Causation

Despite these encouraging trends, it is essential to interpret the data with caution. A decline in cannabis use following legalization does not necessarily mean that legalization is the cause of that decline.

The World Drug Report 2026, published by the United Nations Office on Drugs and Crime (UNODC), emphasizes that the evidence on legalization’s impact on adolescents remains mixed and, in some cases, contradictory. While several regions have observed decreases in youth cannabis use, these trends often coincide with broader behavioral changes among young people.

For example, the COVID-19 pandemic was associated with reduced use of multiple substances, including alcohol and tobacco, among adolescents. This suggests the possibility of a wider “denormalization” of substance use—a cultural shift in which young people are increasingly choosing to avoid or delay experimenting with drugs and alcohol. According to the UNODC, it remains difficult to isolate the specific role that cannabis policy plays within these broader social dynamics.

Looking Beyond a Single Indicator

Focusing solely on declining cannabis use can obscure other important developments. The same Colorado survey reveals that the percentage of teenagers who reported using e-cigarettes in the past 30 days increased slightly, from 9 percent in 2023 to 10 percent in 2025, reversing a previous downward trend.

This is particularly relevant because vaping cannabis is becoming more common among young people. Unlike traditional smoking, vaping can be easier to conceal and may carry different health risks. The UNODC has repeatedly warned that cannabis vaping is an emerging trend that requires closer monitoring.

In addition, broader population-level changes complicate the picture. While youth cannabis use is declining, adult use—especially among young adults—has been increasing in many regions. At the same time, high-THC products are becoming more widely available, raising new concerns about potency and potential health effects.

These factors highlight an important point: a single positive indicator does not capture the full complexity of substance use trends. Improvements in one area may coincide with emerging challenges in others.

What This Means for the Cannabis Policy in Europe

For policymakers in Poland and across Europe, Colorado’s experience offers both reassurance and a note of caution. On one hand, the data do not support the common fear that legalizing cannabis for adults will automatically lead to increased use among teenagers. In fact, a well-regulated market with strict age verification may reduce youth access more effectively than an unregulated illegal market.

On the other hand, the evidence does not provide a simple or definitive answer. The decline in youth cannabis use likely reflects a combination of factors, including changing social norms, broader health trends, and possibly the effects of regulation itself. At the same time, new challenges—such as vaping and the proliferation of high-potency products—require ongoing attention.

Ultimately, the lesson from Colorado is not that legalization is a universal solution, but that policy outcomes depend on implementation, enforcement, and broader social context. A balanced, evidence-based approach—one that considers both the benefits and the risks—remains essential for shaping effective cannabis policy in the years ahead.

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(Featured image by Pavel Danilyuk via Pexels)

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