High potency marijuana, daily use 'strongly linked' to psychosis

High potency marijuana, daily use 'strongly linked' to psychosis

High potency marijuana, daily use 'strongly linked' to psychosis

About 900 people who were diagnosed with a first episode of the disorder at a mental health clinic, including those with delusions and hallucinations, were compared with more than 1,200 healthy patients.

The research involved 901 patients aged 18 to 64 who have first-episode psychosis and have used mental health services in major sites across Europe between 2010 to 2015.

Across all 11 hospitals, about 20 percent of new cases of psychosis appeared to be linked to daily cannabis use, and about 12 percent linked to use of high-potency cannabis.

In Amsterdam, the incidence of first-time psychosis would likely drop from 38 to 19 per 100,000 people per year, while in London, the number of cases would decline from 46 to 32 per 100,000 people.

The legalization of marijuana for both medical and recreational use is gaining positive ground across many USA states, and its acceptance is so rapid despite a lack of comprehensive study on its possible long-term benefits and side effects.

Robin Murray, a professor at the IoPPN who also worked on the study, said it should be noted by all policymakers and any potential cannabis users.

High-strength cannabis, such as skunk, has levels of the psychoactive substance tetrahydrocannabinol (THC) above 10%. [This study] adds a new and novel study design to the evidence available, which consistently indicates that for some individuals there is an increased risk of psychosis resulting from daily use of high potency cannabis.

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Several past studies have found that more frequent use of pot is associated with a higher risk of psychosis - that is, when someone loses touch with reality.

The easy availability of high-THC weed is a recent phenomenon, she notes.

The researchers say the study does not prove a cause-and-effect relationship, but the association between mental health events and heavy marijuana use has been shown in previous studies.

And they said that even medicinal cannabis oil - available in the United Kingdom for a very limited number of people - should come with a warning of psychosis as a possible side effect.

These are also cities where high-potency weed is most easily available and commonly used.

Josie Laurent, 65, said her son Henri, 25, created an imaginary girlfriend, heard voices, pushed his mother and fought with his father and brother after becoming addicted to the drug. "Given the changing legal status of cannabis across the world, and the associated potential for an increase in use, the next priority is to identify which individuals are at risk from daily potent cannabis use, and to develop educational strategies and interventions to mitigate this".

[3] Data derive from the Population Attributable Fraction (PAF) which measures the population effect of an exposure by providing an estimate of the proportion of cases that would be prevented if the exposure (ie, daily/high potency cannabis use) were removed.

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