The scientific evidence is mounting. Marijuana use is not harmless and can permanently impair the mind.
The American Journal of Psychiatry (AJP), for example, has published a long-term study that cuts through the smoke surrounding the debate over marijuana use. Researchers have found a clear link between heavy, long-term cannabis use, particularly when it begins in adolescence, and a permanent decline in intellectual capacity and decision-making.
Such a conclusion clashes with the latest narrative. Once the target of intense government persecution, marijuana use is now rebranded as a harmless, even therapeutic, activity. The public perception of marijuana is lost in a haze of wellness rhetoric. Meanwhile, the scientific community is raising the alarm that users might well be permanently losing their minds.
The Dunedin Experiment: Brain Damage, Lethargy and Crime
The AJP study meticulously tracked 1,037 individuals in New Zealand from age 3 to age 45 who at some point had used marijuana. What they found was far from the harmless “stoner” stereotype perpetuated by the hippie/punk culture and dutifully repeated by the media.
Individuals who engaged in heavy, long-term cannabis use exhibit cognitive impairments across multiple areas. On average, these long-term users saw their IQ decline by 5.5 points from childhood to midlife. For those who began smoking frequently before 18 and maintained the habit, the cognitive toll was even steeper—an average loss of 8 points. Even more unsettling, these losses are never fully restored, even if the individual quits smoking marijuana in adulthood.
Other Studies
The AJP study is supported by other research efforts. According to a study published in the National Institutes of Health (NIH), there is a positive and strong relationship between marijuana use and antisocial behavior among young adults. Chronic users displayed a 700 percent increase in the risk of committing violent crimes over time. Marijuana alters brain functions, occasionally leading to psychosis. It can also lead users down the sinful path of immorality.
The brain’s physical structure pays a significant price for the fleeting pleasure of marijuana. Long-term users develop a smaller hippocampus, the region of the brain responsible for learning, memory, spatial navigation, orientation and linking memories to emotions. These findings align with the portrayal of the classic forgetful, zoned-out “pot head.” Friends and family of the individuals studied corroborated the data, frequently observing newly developed attention and memory deficits.
Not Your Grandfather’s Woodstock Weed
Aggravating this neurological vulnerability is the sheer potency of modern marijuana. Today’s cannabis products are driven by a multibillion-dollar industry, both legal and illegal, that thrives on chemical escalation.
In the seventies, the average THC content, the psychoactive and addictive chemical in cannabis, ranged from a modest 1 to 4 percent. Modern dispensaries offer smoked products with THC levels of 15 to 30 percent, while concentrates, vapes and edibles deliver even higher concentrations. Developing brains are victims of a biological experiment, unprecedented in human history.
Schedule III and Business as Usual
Despite these glaring cognitive risks, both the state and federal political machinery continue to pave the way for commercial expansion. The Trump Administration recently reclassified marijuana as a Schedule III drug under the Controlled Substances Act. Even as a Schedule III substance, recreational marijuana is still a federal offense.
This is not a progressive leap forward. It only expands production by allowing marijuana growers and retailers to deduct business expenses for tax purposes while damaging young (and older) minds.
Such tax write-offs send a subtle message of governmental endorsement for a substance that demonstrably encourages moral decline and harms brain development.
The Legalization Paradox
The marijuana lobby has long promised that state-level legalization would not translate to increased underage use.
Unfortunately, the data tells a different story. A recent study in the Journal of the American Medical Association (JAMA) revealed that adolescent cannabis use in California shot up by 38 percent following the state’s 2016 vote to legalize recreational use. It took the isolation of a global pandemic to temporarily drive that rate back down.
As more states open their doors to legal recreational and medicinal marijuana, the normalization of highly potent THC continues.
Far too many people still cling to the romantic delusion that marijuana is entirely harmless. However, science is clearing the air and showing just how much permanent damage is being done to the individual users, their families and the nation.
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