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THC is the main psychoactive ingredient of cannabis and is responsible for giving users the high and the mind-altering effects. This is why cannabis products with high THC content is more associated with the recreational use of the drug.

The study, published in the journal the Lancet Psychiatry on Tuesday, presents evidence that is consistent with previous studies in suggesting that high-potency cannabis and the heavy use of the drug can be harmful to the mental health of users. A cannabis product is considered to have high potency if it contains at least a 10% concentration of THC.