Cocaine
When cocaine is chewed or eaten, inhaled into the nose ("snorted"), or injected into the veins, it causes people to feel euphoric (very happy), alert, very confident, and full of energy.  This feeling is called being "high."  Some people who take cocaine also have unpleasant feelings.  They may feel worried, anxious, or even paranoid.  They may also have physical symptoms, like shaking, a high heart rate, and high body temperature.