Caffeine addiction

Nowadays, coffee and tea are the most popular hot beverages in the world. Tea is an important part of some cultures and countries like China and Japan. Chinese used to drink tea thousands years ago. But those, who used tea and coffee for stimulating purposes, were sufits of Yemen. They drank tea in order to stay awake during prayers in 15th century. 17th century was the time when coffeehouses opened in Europe. Since then coffee and tea became a popular beverage.