Cocaine is a stimulant, which means that it produces a fast, intense feeling of power and energy. Then it wears off (crack wears off very quickly) and the user feels depressed and nervous and craves more of the drug to feel good again.
Cocaine is so addictive that someone can get hooked after trying it just once.
Snorting cocaine can damage the septum between the nostrils, causing a hole in the middle of the nose.
Cocaine makes the heart beat faster and blood pressure and body temperature go up. It also can make the heart beat abnormally. Cocaine is so dangerous that using it just once can cause a heart attack, stroke, or even death.