What people are consuming now is the product of a weed “arms race,” Robert MacCoun, a drug policy expert at the University of California at Berkeley, has said. In the 1990s, THC levels ran in the range of 3.7 to 10 percent. These days, the average potency on the Colorado market is 18.7 percent, according to a lab test.**********
Another study published by the Lancet in 2015 reported that patients using high-potency cannabis show a three-times increase in psychotic disorder risk.
According to a 2015 study conducted by researchers at Yale School of Medicine, using marijuana makes a person two and a half times more likely to abuse prescription opioids.
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