Erowid References Database
Mirken B, Earleywine M.
“The cannabis and psychosis connection questioned: a comment on Fergusson et al. 2005”.
Addiction. 2005 May;100(5):714-5; author reply.
Fergusson and colleagues assert that their results from a
New Zealand cohort ‘add to the growing body of evidence
that regular cannabis use may increase risks of psychosis’
. In fact, their study raises more questions than it
One obvious question is raised by their use of ten items
from Symptom Checklist 90 as the only assessment tool
for symptoms of psychosis. The items assessed focus
heavily on paranoid ideation, e.g. ‘feeling other people
cannot be trusted’, ‘feeling you are being watched or
talked about by others’, and ‘having ideas or beliefs that
other do not share.’ This is of concern because it is well
known—widely reported in the literature  and commonly
referenced in popular culture for decades [3,4]—
that paranoid feelings are a relatively frequent effect of
acute marijuana intoxication.
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