Tell Your Children
The marijuana-psychosis link
Description
In 2016, a psychiatrist named Dr. Suzanne Berenson told her husband, over dinner, that a patient of hers had committed a horrifying act of violence — and that the man had been a heavy cannabis user, as so many of her most disturbed patients were. Her husband, Alex Berenson, was a former New York Times reporter who had covered pharmaceuticals and knew how to read a study. He assumed she was overstating a coincidence. He went looking for the research that would prove her wrong. He did not find it. What he found instead became the book Tell Your Children, published in early 2019 — a title borrowed, with dark irony, from the original name of the 1936 anti-marijuana propaganda film later known as Reefer Madness.
The timing was pointed. Recreational cannabis had by then been legalized in nine states, medical use in far more, and the American consensus had settled: the drug was, at worst, harmless, and at best a wellness product marketed alongside kombucha. Berenson set out to argue the opposite — that the case for legalization rested on claims that did not survive contact with the evidence, and that one claim in particular, the link between heavy cannabis use and psychosis, had quietly stopped being a matter of serious scientific dispute.
The book was, and remains, contested. Researchers pushed back on how Berenson read correlation as cause, and how he handled the violence statistics. But the argument he assembled is coherent, forcefully made, and worth following on its own terms — because it asks an uncomfortable question about a substance tens of millions of people now use without a second thought.
The question we’re asking : What did a former New York Times reporter conclude when he went looking for the evidence that cannabis was safe — and found the opposite?What we’ll see : How a national consensus formed, what the science on psychosis actually says, and what happens when belief about a drug outruns the data.
Table of contents
01Chapter 1 — The myths legalization was built on
Berenson begins by dismantling the arguments that carried legalization across the finish line, because he thinks most of them are false. Take the prison story. The image driving reform was of jails filled with people locked up for smoking a joint. But the data, Berenson argues, show almost no one serving real time for simple possession. The overwhelming majority of marijuana arrests end in fines or diversion; the people actually incarcerated on cannabis charges are typically dealers, or holding cannabis alongside other offenses. The myth was emotionally powerful and, in his telling, statistically hollow.
Then there is medical marijuana, the wedge that opened the door in state after state. The picture Berenson paints is not of physicians prescribing cannabis for cancer patients in careful doses. It is of a small number of doctors writing the vast majority of authorizations — often after a brief consultation, often for people who were already using the drug and wanted legal cover. Medical marijuana, in this reading, functioned less as medicine than as a legal on-ramp to recreational use, dressed in a white coat.
02Chapter 2 — A London lab and a link scientists stopped debating
The heart of the book is at the Institute of Psychiatry in London, where researchers including Sir Robin Murray spent decades studying the relationship between cannabis and psychosis. Psychosis, in the clinical sense, means a break with reality — hallucinations, delusions, paranoia — the symptom cluster that defines schizophrenia and related disorders. The question Murray and his colleagues pursued was whether cannabis could cause it, not merely accompany it. Berenson's contention is that after all those years of work, they concluded that it can.
The evidence he marshals is layered. Long-running studies followed thousands of people and found that heavy cannabis users, particularly those who started as teenagers, developed psychotic disorders at markedly higher rates. The more someone used, and the more potent the product, the higher the risk — a dose-response pattern that scientists treat as a signature of causation rather than coincidence. And the potency has changed dramatically: the THC content of cannabis today dwarfs what circulated in the 1970s, a different chemical experience wearing the same familiar name.
03Chapter 3 — From psychosis to violence
Here the book takes its most provocative turn. If cannabis can trigger psychosis, and psychosis is a known driver of violence, then, Berenson reasons, widespread heavy use should leave a mark in the violence statistics. It is a chain of inference, and each link is where his critics dug in — but he follows it without flinching. Psychiatry has long documented that people in the grip of paranoid delusions can act on them, sometimes catastrophically, and Berenson argues the cannabis-psychosis pathway is one route into that state.
He reaches for the ground-level cases that give the abstraction a face. In Colorado, a man named Richard Kirk ate a THC-laced candy — an edible far stronger than he understood — descended into a paranoid episode, and shot his wife while she was on the phone with a 911 dispatcher. He is serving a thirty-year sentence. Berenson treats such stories not as freak accidents but as the visible edge of something more diffuse spreading through the population as potent cannabis becomes ordinary.
04Chapter 4 — When a country decides what to believe
Step back from the individual claims and Tell Your Children becomes a study in how a society settles a question of safety — and how quickly a story can harden into common sense before the evidence is in. Within a single generation, cannabis went from a criminalized menace to a legal wellness product, and the reversal happened not because the science had resolved the danger but because the culture had lost patience with the old fear. Reefer Madness had been so absurd, so obviously propaganda, that its collapse seemed to discredit the entire idea that cannabis might be harmful. Berenson's provocation is that the pendulum swung too far: we mistook the failure of one bad argument for the truth of its opposite.
What interests him is the machinery of consensus. An industry with money to make had every reason to promote the harmless narrative. Reporters, himself once among them, found the wellness angle more agreeable than the buzzkill one. Politicians read the polls. And the science that complicated the story — dense, hedged, published in journals nobody outside psychiatry reads — never had a spokesman as loud as the dispensary on the corner. Belief outran data, and once a belief is comfortable, contradicting it feels like scaremongering rather than reporting.
05Conclusion
The book ends more or less where it began — with a reporter who expected to reassure himself and could not. Berenson does not call for a return to prohibition, and he does not claim cannabis destroys everyone who touches it. His claim is narrower and, he thinks, harder to dodge: that heavy use of today's high-potency cannabis carries a real risk to mental health, that the risk falls hardest on the young, and that a society rushing to legalize chose not to look at it clearly.