it appears necessary to keep the alkaloid contained within the leaf as it naturally occurs and, like caffeine, use it orally and moderately

According to anthropologist Joseph Kennedy’s 1986 book Coca Exotica

"it appears necessary to keep the alkaloid contained within the leaf as it naturally occurs and, like caffeine, use it orally and moderately to achieve the desired effect. With these provisions, it would be difficult to make a moral or legal distinction between sipping a cup of coffee in New York City and chewing a handful of coca leaves in Cuzco."