High potency pot 'strongly linked' to psychosis - study

PARIS: High potency cannabis, especially when used daily, is 'strongly linked' to the risk of developing psychotic disorders such as schizophrenia and paranoia, scientists said Wednesday.

In Amsterdam and London -- where high-THC marijuana has long been the rule rather than the exception -- 50 and 30 percent of new psychosis cases, respectively, were associated with potent forms of the drug.