In fact, the first experiment documenting pot's anti-tumor effects took place in 1974 at the Medical College of Virginia at the behest of the U.S. government. The results of that study, reported in an Aug. 18, 1974, Washington Post newspaper feature, were that marijuana's psychoactive component, THC, "slowed the growth of lung cancers, breast cancers and a virus-induced leukemia in laboratory mice, and prolonged their lives by as much as 36 percent."
Despite these favorable preliminary findings, U.S. government officials banished the study and refused to fund any follow-up research until conducting a similar -- though secret -- clinical trial in the mid-1990s. That study, conducted by the U.S. National Toxicology Program to the tune of $2 million, concluded that mice and rats administered high doses of THC over long periods had greater protection against malignant tumors than untreated controls.
However, rather than publicize their findings, government researchers shelved the results, which only became public after a draft copy of its findings were leaked in 1997 to a medical journal which in turn forwarded the story to the national media.
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