Caffeine is the most widely consumed drug in the world, most commonly from the beverages coffee, tea and soda. An estimated 80% of the world's population consumes a caffeine-containing substance daily. A typical 8-ounce (240-ml) cup of instant coffee contains about 100 mg of caffeine — about twice as much as a cup of tea or a 12-ounce (360-ml) can/bottle of soda. A 30-gram chocolate bar might contain as much caffeine as half a cup of tea. Pure caffeine can be obtained in powders, caplets or tablets in products like NoDoz.