I am not sure what I make of this.

“We’ve long suspected that cannabis is linked to psychoses, but we have
never before had scans to show how the mechanism works,” said Dr. Philip
McGuire, a professor of psychiatry at King’s College, London.

In analyzing MRI scans of the study’s subjects, McGuire and his colleagues
found that THC interfered with activity in the inferior frontal cortex, a
region of the brain associated with paranoia.

“THC is switching off that regulator,” McGuire said, effectively unleashing
the paranoia usually kept under control by the frontal cortex.