Caffeine is the most widely used drug in the world.
It is a physically addictive stimulant that is naturally produced in the leaves and seeds of many plants. FYI , When coffee is decaffeinated by chemical process, the caffeine that remains is sold from coffee companies to many beverage companies. That shows you how valuable it is to the soft drink industry. People have enjoyed caffeinated beverages for thousands of years. The earliest record of caffeine consumption dates back to around 2700 B.C., when Chinese Emperor Shen Nung drank strong, hot brewed tea.