Teenagers who use cannabis may face a significantly higher risk of developing serious mental health disorders later in life, according to a major new study involving more than 463,000 adolescents.
Researchers found that cannabis use during adolescence was associated with approximately twice the risk of developing psychotic and bipolar disorders by early adulthood. The study also identified increased risks of depression and anxiety, although these associations were less pronounced.
The research followed participants between the ages of 13 and 17 over several years, tracking their mental health through early adulthood. Scientists observed that cannabis use typically preceded the onset of psychiatric conditions by nearly two years, strengthening concerns about its impact on the developing brain.
Experts stress that the findings do not prove cannabis is the sole cause of mental illness. However, they say the strong association highlights the importance of delaying or avoiding cannabis use during adolescence, when the brain is still undergoing critical development.
Medical professionals are particularly concerned about today’s cannabis products, which often contain much higher levels of THC than in previous decades. Higher-potency products may increase the likelihood of addiction and serious psychiatric complications among young users.
Researchers believe the findings should encourage parents, schools and healthcare providers to educate teenagers about the potential long-term risks associated with cannabis use. They also call for stronger prevention programmes and public health campaigns aimed at reducing youth exposure to the drug.
The study adds to a growing body of scientific evidence suggesting that cannabis use during adolescence can have lasting effects on mental health, particularly when use begins at an early age or becomes frequent.
