Long Term Liability if Cannabis Rots Our Brains

It all starts with correlation. In 1950, the British Medical Journal published an article showing a high correlation between lung cancer and smoking tobacco. In 1998, the tobacco industry entered a settlement agreement with the attorneys general of 46 states, agreeing to change its marketing tactics, to abandon certain industry groups, and to pay out more than $206 billion.

Fast forward to a couple of days ago, when the journal Psychological Medicine published an article showing an alleged correlation between patients smoking high-potency cannabis and damage to the white matter connections in their brains. A group of researchers from King’s College in London studied 56 individuals with first-episode psychosis and 43 individuals without any history of psychosis. The researchers took brain MRIs of the subjects and had them answer questions about their past illicit drug use, including their use of cannabis. The researchers’ primary finding was that frequent use of high-potency (meaning 16-22% THC) cannabis is “significantly...

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