Blog #148 Is Cannabis Harmful to Our Children?
Six years after Tell Your Children, Fox News asked me to update the world on the harms of cannabis
Jul 01, 2025
Yesterday, a Fox News digital producer asked if I had anything to say about the growing evidence that cannabis is more harmful than scientists thought even a year ago. I told her I had plenty, and I’d be glad to write it, as long as I could cross-post the piece here.
The article is below. A much more straightforward style than I usually use here, but I hope you enjoy it.
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The news about marijuana keeps getting worse.
As drug advocates pushed marijuana legalization over the last 15 years, they portrayed the drug as harmless, a mild intoxicant with few side effects. Cannabis – the term scientists prefer for marijuana – might even have medicinal value, advocates said.
The truth is the opposite.
Even as states from Maine to California have legalized cannabis, researchers have published paper after paper showing its risks, particularly to heavy or daily users. I do not mean the munchies or falling asleep on the couch. Powerful evidence links the drug to heart attacks, strokes, severe mental illness, and even suicides.
Cannabis and its active ingredient, the chemical called THC, are toxic to the heart and brain. They are also much more addictive than many users realize. Though cannabis does not cause the physical dependence of alcohol, it can make users psychologically dependent, leading to irritability, depression, and mood swings if they cut back. And a huge new study shows that legalization is linked to a sharp increase in diagnoses of cannabis addiction.
As more Americans see the problems firsthand, their views of cannabis are slowly turning negative, a recent Gallup poll found. Even in deep-blue New York, almost twice as many residents say cannabis legalization has hurt their quality of life as helped it.
But just as it took decades for the public to realize the cancer risks of cigarettes, the health harms of cannabis are not completely understood. A majority of Americans still favor legalization – a fact that makes the emerging science even more alarming.
In March, scientists in Boston reported cannabis users under 50 had a sixfold higher risk of heart attacks compared to people who didn’t. In February, Canadian researchers found people hospitalized with a diagnosis of cannabis abuse were six times as likely to die as the average person over the next five years. Suicides and trauma-related deaths made up much of the increase.
The research on the psychiatric harms of cannabis is also piling up.
The connection between cannabis and severe mental illness, including the psychotic disorder schizophrenia, comes as no surprise to me. In 2019, I wrote the book “Tell Your Children: The Truth About Marijuana, Mental Illness, and Violence.” At the time, drug legalizers and their media handmaidens sharply criticized the book. The Guaradian, a leftist British newspaper, called it “pure alarmism.”
Six years later, Tell Your Children has been vindicated. In April, researchers in Quebec found a crucial mechanism in the brain by which cannabis can cause hallucinations and delusions. And just weeks ago, physicians in Colorado – the first state to legalize cannabis recreationally – reported that diagnoses of psychosis in young people have soared in the last 15 years, with diagnoses in heavy cannabis users driving the increase.
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