Caffeine is a mild stimulant, it stimulates the brain and increases your heart rate and blood pressure.
HOW DO DRUGS AFFECT YOU
Many of the drugs used for medical treatment have little or no effect on your nervous system. However all of the drugs which people use for pleasure affect the brain and the way your nervous system works. It is these changes which people enjoy when they use the drug. These changes can cause addiction.
Some drugs like caffeine , nicotine and cocaine speed up the activity of your brain, they make you feel more energetic and alert.
Others like alcohol and cannabis slow down your brain making you feel calm and more able to cope. Heroin actually stops impulses travelling in your nervous system, so you don't feel any pain or discomfort. Cannabis can make you…