The researchers found that THC, the main psychoactive ingredient in weed, and cannabidiol, an extract, caused "dramatic reductions" in the growth of glioma tumors in mice. Glioma accounts for 80 percent of malignant brain tumors in humans. "We've shown that cannabinoids could play a role in treating one of the most aggressive cancers in adults," Dr. Wai Liu, lead author of the study, wrote in an op-ed for the Huffington Post last year. Previous studies have shown that THC may have anti-tumor benefits, but the wrong dose can potentially increase the size of tumors.
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