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This Concept Map, created with IHMC CmapTools, has information related to: Drugs_sk, natural sources are tobacco leaves, natural sources are cocoa fruit, Drugs was early used in association to their natural sources, natural sources are coffee beans, opium poppy pods provoked "opium wars", tobacco leaves were imported by Colombo 1496, opium poppy pods are known from prehistoric men, natural sources are tea leaves, natural sources are opium poppy pods