Andrew Leunig, whose son Patrick died after using cannabis, has spoken publicly about the findings of a major new research project that examines the relationship between cannabis use and psychosis.
Patrick Leunig developed psychosis at a relatively young age, which his father believes left him with less resilience to manage the condition. "If Patrick had developed psychosis later in life, he may have had more resilience to cope," Andrew Leunig said.
The study, described as landmark by researchers, provides fresh insights into how cannabis interacts with brain development in adolescents and young adults. It adds to a growing body of evidence linking heavy cannabis use—particularly high-potency strains—to an increased risk of psychotic disorders.
Mental health experts say the findings underscore the need for better public education about the risks of cannabis, especially for young people whose brains are still developing. They also highlight the importance of early intervention for those showing signs of psychosis.
The research comes amid a broader debate about cannabis legalization and regulation. Advocates for legalization argue that regulated markets can reduce harm by controlling potency and providing consumer warnings, while opponents point to studies like this as evidence of the drug's dangers.
For Andrew Leunig, the study is both a source of painful reflection and a potential tool for preventing other families from experiencing similar tragedies. "We need to understand these risks better, so young people and their families can make informed choices," he said.