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With more than 400 billion cups consumed each year, coffee is the world's most popular beverage. Americans drink 450 million cups of coffee a day. About half of all Americans over the age of 18 - 107 million people - drink coffee every day. On average, each coffee drinker drinks three and a half cups a day. The economic livelihoods of nearly 25 million farmers around the world depend on coffee crops. Coffee contains caffeine, a stimulant that gives you a "high". Caffeine is the most popular drug in the world, with 90 percent of Americans consuming it in some form every day.