Cocaine is a drug, like alcohol and marijuana. It comes from certain leaves that grow in South America and is sometimes used as a medicine. In the United States, it is against the law to use, sell, or give away cocaine. It is dangerous because it can make people very sick, and some people have even died from using it. It is especially dangerous when mixed with other drugs, like alcohol or marijuana. If you break the law and use, sell, or give away cocaine, you could face a lot of trouble from the police.