Cocaine (crack, powder, coke, white, blow, snow or flake) is a powerfully addictive drug that is snorted, sniffed, injected or smoked. Crack is a form of cocaine that has been processed to provide a strong cocaine experience in small, low-priced packages and is usually smoked. A powerfully addictive drug, cocaine usually makes the user feel euphoric and energetic. Common health effects include heart attacks, respiratory failure, strokes and seizures. Large amounts can cause bizarre and violent behavior. In rare cases, sudden death can occur on the first use of cocaine or unexpectedly thereafter.