There's a drug whose appeal shows no sign of slowing. It's a stimulant for the central nervous system and it was an ingredient in 136 million bags exported around the world in 2012.
Those bags were coffee and the drug was caffeine - but there's a lot more to it than just the one beverage. Tea, energy drinks, chocolates, chewing gum, sweets and even weight-loss tablets have all got a caffeine content. A comparison.
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