July 26, 2022 – The researchers found that people who use high-potency marijuana are more likely to experience addiction than those using low-potency products. The study also suggests that people using high-potency cannabis are more likely to experience a psychotic disorder, such as schizophrenia.

“These results are important in the context of harm reduction, which aims to minimize the negative consequences associated with drug use,” said study author Kat Petrilli, from the university’s department of psychology. “While the safest level of use for cannabis is of course ‘no use,’ it is important to acknowledge that a significant number of people across the world use cannabis regularly and to ensure they can make informed decisions that could reduce any possible harms associated with it.”

This helps to explain why more people have received treatment for cannabis problems over recent years, according to the study. Data from the European Monitoring Centre for Drugs and Drug Addiction showed a 76% increase in people entering treatment for cannabis addiction over the past 10 years.

Marijuana is third only to alcohol and nicotine as the most widely used drugs worldwide.


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