The Dangers of Marijuana and Its Links to Psychosis

Medical research has long recognized that excessive marijuana use, particularly during adolescence, can lead to mental health issues, including psychosis. Recent evidence highlights the potential for marijuana to induce severe psychological disturbances, sometimes resulting in violent behavior.

The recent shooting at a Minneapolis Catholic school, which resulted in two children being killed and 18 others wounded, was partly attributed by the perpetrator to marijuana and other factors. The shooter, Robin Westman, a 23-year-old who also worked at a cannabis dispensary, reportedly struggled with mental health issues linked to his drug use. In a diary, he wrote: “Gender and weed messed up my head,” and advised others against experimenting with both during their teenage years.

While it’s unclear whether marijuana directly caused his rampage, the connection between cannabis, psychosis, and schizophrenia is well established. A 2019 review confirmed that cannabis users are at a higher risk of developing psychotic illnesses, with increased use correlating with earlier onset and more severe symptoms. Adolescent use, in particular, raises the risk of psychosis by 71% and accelerates its development.

Genetic studies further support this link. A 2017 study using Mendelian randomization found that cannabis use could increase the likelihood of schizophrenia by approximately 37%. Although not all violent individuals are schizophrenic, the evidence suggests that mental illness may play a role in extreme acts, especially when substance abuse is involved.

Implications of Legalizing Marijuana

Currently, political debates focus on whether to loosen federal restrictions on marijuana. However, critics argue that such moves may exacerbate mental health problems and lead to more violent incidents. Despite claims from industry advocates that rescheduling marijuana would aid research, it primarily benefits commercial interests by allowing businesses to deduct expenses and expand.

Legalization is likely to increase the number of marijuana consumers, including young people, potentially leading to higher rates of addiction and related mental health issues. The case of the Minneapolis shooter emphasizes the potential dangers of increased access to cannabis, especially among impressionable adolescents.

What Should Be Considered?

Before advancing drug policy reforms, policymakers should consider cases like Minneapolis, where mental health problems, possibly fueled by marijuana use, contributed to tragedy. Balancing commercial interests with public safety and health must remain a priority to prevent further harm.