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Almost no one—not even the police officers who deal with it every day, not even most psychiatrists—publicly connects marijuana and crime. We all know alcohol causes violence, but somehow, we have grown to believe that marijuana does not, that centuries of experience were a myth. As a pediatrician wrote in a 2015 piece for the New York Times in which he argued that marijuana was safer for his teenage children than alcohol: “People who are high are not committing violence.” But they are. Almost unnoticed, the studies have piled up. On murderers in Pittsburgh, on psychiatric patients in Italy, on tourists in Spain, on emergency room patients in Michigan. Most weren’t even designed to look for a connection between marijuana and violence, because no one thought one existed. Yet they found it. In many cases, they have even found marijuana’s tendency to cause violence is greater than that of alcohol. A 2018 study of people with psychosis in Switzerland found that almost half of cannabis users became violent over a three-year period; their risk of violence was four times that of psychotic people who didn’t use. (Alcohol didn’t seem to increase violence in this group at all.) The effect is not confined to people with preexisting psychosis. A 2012 study of 12,000 high school students across the United States showed that those who used cannabis were more than three times as likely to become violent as those who didn’t, surpassing the risk of alcohol use. Even worse, studies of children who have died from abuse and neglect consistently show that the adults responsible for their deaths use marijuana far more frequently than alcohol or other drugs—and far, far more than the general population. Marijuana does not necessarily cause all those crimes, but the link is striking and large. We shouldn’t be surprised. The violence that drinking causes is largely predictable. Alcohol intoxicates. It disinhibits users. It escalates conflict. It turns arguments into fights, fights into assaults, assaults into murders. Marijuana is an intoxicant that can disinhibit users, too. And though it sends many people into a relaxed haze, it also frequently causes paranoia and psychosis. Sometimes those are short-term episodes in healthy people. Sometimes they are months-long spirals in people with schizophrenia or bipolar disorder. And paranoia and psychosis cause violence. The psychiatrists who treated Raina Thaiday spoke of the terror she suffered, and they weren’t exaggerating. Imagine voices no one else can hear screaming at you. Imagine fearing your food is poisoned or aliens have put a chip in your brain. When that terror becomes too much, some people with psychosis snap. But when they break, they don’t escalate in predictable ways. They take hammers to their families. They decide their friends are devils and shoot them. They push strangers in front of trains. The homeless man mumbling about God frightens us because we don’t have to be experts on mental illness and violence to know instinctively that untreated psychosis is dangerous. And finding violence and homicides connected to marijuana is all too easy.
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Alex Berenson (Tell Your Children: The Truth About Marijuana, Mental Illness, and Violence)