The link between cannabis and its effects on mental health, particularly schizophrenia, continues to spark debate. While many tout marijuana’s calming effects, particularly in online forums, mental health experts caution against its use—especially among young people. Research increasingly reveals a concerning relationship between cannabis use and psychotic disorders like schizophrenia.

Beyond the “high” associated with marijuana, many users report paranoia or hallucinations while under the influence. This is due to the active component, Tetrahydrocannabinol (THC). THC binds to receptors in the brain and triggers a series of reactions in brain cells. Typically, these effects fade after the high wears off, but in some cases, they may last longer, leading to what’s known as cannabis-induced psychosis.

In high-risk individuals, cannabis can disrupt brain development and lead to conditions like schizophrenia—a severe mental illness characterized by long-term hallucinations, delusions, and paranoia. A Finnish study of 18,000 individuals with cannabis-induced psychosis found that nearly 50% were later diagnosed with schizophrenia (1). Other studies confirm that regular use, especially of high-potency products, increases the risk of developing schizophrenia by four times (2). This risk is comparable to the relationship between high cholesterol and heart disease.

The Specialized Treatment Early in Psychosis (STEP) program at Yale found that over 75% of patients with early schizophrenia had a history of cannabis use, further cementing this link (3).