Di Forti et al. (47) |
“First-episode” psychiatric patients (n = 280) |
Self reported frequency and type of cannabis used |
The chance that high-potent cannabis (THC) has been used is higher among “first-episode” psychotic patients than among non-psychotics |
Also more frequent use in “first-episode” psychotic patients |
Morgan and Curran (45) |
Cannabis users (n = 154) |
Grouping based on presence of THC and/or CBD in hair |
More psychotic symptoms among THC group in comparison with no THC group and in group with THC and CBD in hair |
THC might be psychotogenic and CBD might protect against this effect |
Schubart et al. (48) |
Websurvey among cannabis users (n = 1877) |
Grouping based on self reported preference for type of cannabis |
Less psychotic symptoms in cannabis users who use cannabis with high level of CBD (hash) |
Personal communication with author (Schubart) |
Morgan et al. (46) |
Cannabis users, at least once a month (n = 134) |
Choosing cannabis by cannabis user |
Acute effects on mood, psychotic symptoms, and cognition |
CBD attenuates the THC-induced memory impairment; CBD does not affect psychotomimetic symptoms |
Morgan et al. (49) |
Recreational cannabis users (n = 54) versus daily users (n = 66) |
Measuring THC and CBD in hair |
THC increases possibility of negative psychotic symptoms, CBD antagonizes (part of) THC-induced effects |
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