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According to popular belief, the coca leaf extract cocaine was once added to
Coca-Cola, per se. Because cocaine is naturally present in untreated coca
leaves, small amounts of cocaine were also present in the beverage. Today's
Coca-Cola uses "spent" coca leaves, those that have been through a cocaine
extraction process, to flavor the beverage. Since this process cannot extract
the cocaine alkaloids at a molecular level, the drink still contains trace
amounts of the stimulant[24]. The United States DEA oversees the importation of
coca for Coca-Cola, and later sale of the extracted cocaine to the drug
industry.[25]