New Strains of Potent Pot Cause Memory Loss and Addiction, Study Finds

High-potency pot is causing psychiatric issues, including addiction and memory problems. New strains of the recreational drug have higher levels of the active chemical and not enough of another compound that keeps the drug safe.

And as a new study this week documents, the riskiest pot is coming from the black market—which could be an argument for expanding legalization, according to Newsweek.

The new report, published this week by Manchester Metropolitan University in the U.K., tested 50 samples of cannabis in the city of Manchester. The study was conducted by Volteface, a London-based policy think tank seeking reform for laws to improve safety of the drug by making it legal, and thus limiting demand on the local black market.

All of the samples had high levels of tetrahydrocannabinol (THC), the psychoactive component of the drug that produces the “high,” and inconsequential amounts of cannabidiols (CBDs), the protective compound of the drug that prevents from becoming unsafe.

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