Proponents of cannabis say that there is no harm in smoking a joint, but a new study by McGill University finds otherwise. The research indicates young adults at high risk for psychosis can aggravate their symptoms by using cannabis.

While it has been known in the scientific community that cannabis can cause psychotic episodes, including schizophrenia, the newest research backs up these claims. The study indicates a reduction in the brain’s synaptic density after cannabis consumption for those with a propensity toward psychosis. Symptoms like lack of motivation and social withdrawal are tied to decreased synaptic density.

“Not every cannabis user will develop psychosis, but for some, the risks are high. Our research helps clarify why,” said Dr. Romina Mizrahi, professor at McGill’s Department of Psychiatry and one of the study authors.

The study aims to help researchers find treatment for those at risk. Current medications do not provide relief for social withdrawal-type symptoms.

“By focusing on synaptic density, we may eventually develop therapies that enhance social function and quality of life for those affected,” said study author Belen Blasco, a PhD student at McGill’s Integrated Program in Neuroscience.

The study researched at the Douglas Mental Health University Institute and McGill University’s Montreal Neurological Institute-Hospital, was backed by the Canadian Institute of Health Research.

Researchers used state-of-the-art brain scanning techniques to study participants, aged 16 to 30. The group included young adults with existing symptoms, those considered at high risk, and control group participants without symptoms.

Source: McGill University Study https://www.mcgill.ca/newsroom/channels/news/cannabis-disrupts-brain-activity-young-adults-prone-psychosis-study-361318