In 1970, however, the Controlled Substances Act classified it as illicit and made possession a felony because, like other drugs in its category, it has a high potential for abuse, has no currently accepted medical use
in the U.S., and lacks adequate guidelines for safe use
under medical supervision.
This hasn’t dampened the enthusiasm of significant parts of the population for using it, however. It’s long been considered relatively benign compared to opiates, stimulants, and even alcohol.