This Is Your Mind On Plants

Of all the things humans rely on plants for—sustenance, beauty, fragrance, flavor, fiber—surely the most curious is our use of them is to change consciousness: to stimulate or calm, fiddle with or completely alter, the qualities of our mental experience. Take coffee and tea: people around the world rely on caffeine to sharpen their minds. We dont usually think of caffeine as a drug, or our daily use as an addiction, because it is legal and socially acceptable. So then what is a drug? And why, for example, is making tea from the leaves of a tea plant acceptable, but making tea from a seed head of an opium poppy a federal crime?