People have been chewing on substances made from plants, grasses, and resins for a long time. The Ancient Greeks chewed mastic gum, made from the resin of the mastic tree. The Chinese used ginseng plant roots and the Mayans and Aztecs used chicle, a natural tree gum, as a base for making a gum-like substance. But modern-day chewing gum was mainly commercialized in the United States where the American Indians chewed resin made from the sap of spruce trees.

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