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The study found that those who used pot daily were three times more likely to have a psychotic episode compared to someone who never used the drug. Those who started using cannabis at the age of 15 or less had a slightly more elevated risk than those who started using in later years. Use of high potency weed almost doubled the odds of having psychosis compared to someone who had never smoked weed, explains Di Forti. And for those who used high potency pot on a daily basis, the risk of psychosis was even greater — four times greater than those who had never used. - www.npr.org