Caffeine is a biologically active molecule found in many foods and drinks including coffee, tea, cola drinks, and chocolate. It is, by far, America's most popular drug.
Caffeine is an addictive drug.
Although far more mild than drugs like amphetamines, cocaine, and heroin, caffeine uses the same mechanisms to stimulate the brain. It's often used by people like students and truck drivers who need to stay awake late into the night. Many people feel the need to have a morning cup of coffee to make them more alert. These people are most likely addicted to the caffeine the coffee provides. In this Internet activity, you will learn more about the chemistry of caffeine and how much is contained in popular soft drinks.