Published on: 2026-08-26
Source: United Nations – United Nations –
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August 25, 2026 Healthcare
The World Health Organization (WHO) has presented an updated review of the consequences of non-medical cannabis use for the first time since 2016. Over the past ten years, the situation has changed so much that, according to experts, previous conclusions no longer reflect reality. New strains, new methods of consumption, changes in legislation, and the growth of scientific data have forced experts to reconsider approaches to risk assessment.
Cannabis remains the most widely used psychoactive substance in the world – around 250 million people used it in 2024. “Since the previous report was published, significant changes have occurred in the composition of cannabis products, policy, and research,” the document states.
The organization reminds that in 2020, agreeing with the WHO recommendation, the UN Commission on Narcotic Drugs removed cannabis from the strictest control category, which facilitated scientific research. However, this does not mean the substance has become safe. On the contrary, new data show an increase in risks, especially for teenagers and young adults.
The WHO notes an increase in the number of treatment admissions for cannabis-related disorders. Experts emphasize that modern products often contain significantly higher concentrations of tetrahydrocannabinol, the main psychoactive component of cannabis, than ten years ago, which intensifies both short-term and long-term negative effects.
Short-term and long-term consequences
Short-term effects include impairments in perception, attention, and coordination, which increase the risk of injuries, especially on the roads. The document also describes cases of panic attacks, hallucinations, and emergency medical consultations.
Long-term effects are even more dangerous. Regular use can lead to addiction, with a risk of about one in ten among those who have ever used cannabis. The document emphasizes that addiction is accompanied by tolerance, withdrawal syndrome, and decreased control over usage.
Danger for teenagers
Special attention in the report is given to adolescents: regular use at a young age is associated with cognitive development disorders, increased risk of psychoses, and depressive disorders. WHO notes that new studies confirm the link between cannabis use and an increased likelihood of psychotic episodes, especially in people with a genetic predisposition.
The updated review also addresses the physical consequences of cannabis use: from respiratory issues to cardiovascular risks. The document concludes: “Smoking cannabis may provoke coronary problems in young people who are generally considered to be at low risk.”
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