Yes, I've been thinking this as well. Although, earlier civilisations probably also consumed lots of stimulants; mayas, incas, probably countless more.
Plus, plenty, maybe half, of humans/mammals do not respond to caffeine in positive ways. While one half are evangelical, the rest manage with water.
Plus, plenty, maybe half, of humans/mammals do not respond to caffeine in positive ways. While one half are evangelical, the rest manage with water.