The potency of cannabis sold on America's streets has jumped from 4 percent to more than 15 percent in recent years, raising the risks of addiction and psychiatric disorders, according to a leaked report from .A draft document commissioned by the state's Health Care Authority shows the levels of THC, the psychoactive ingredient in pot, found in drug-bust seizures has risen steadily since the 1990s, thanks to the breeding of powerful plants.It raises fears about high-strength pot raising rates of addiction and mental health problems, and poses tough questions for a multibillion dollar legal pot industry across a growing list of states that engineers ever-stronger products to boost profits.
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