And Caffeine Caffeine enjoys the distinction, along with alcohol , of being one of the most widely used drugs in the United States.
Caffeine is a chemical that occurs naturally in coffee, tea, kola nuts, and chocolate.
It can cause heart palpitations, high blood pressure, convulsions, secretion of stress hormones, and vomiting. Caffeine also reduces the flow of blood to the brain by causing the blood vessels in the brain to constrict. Caffeine is addictive because the body adapts to its presence. A person trying to cut back on caffeine will experience a typical withdrawal headache. To avoid this withdrawal, it is essential to cut back on caffeine slowly.