Researchers from Boston Medical Center examined medical data from 54 healthcare organizations across the United States and Europe. They identified almost 97,000 patients with documented cannabis use and matched them with 4.16 million patients who had no record of using cannabis. After five years of follow‑up, the incidence of type 2 diabetes among users was 2.2 %, compared with 0.6 % among non‑users—a clear and striking association.
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