Cocaine dependence (or addiction) is a psychological desire to use cocaine regularly. Cocaine overdose may result in cardiovascular and brain damage such as constricting blood vessels in the brain, causing strokes and constricting arteries in the heart, causing heart attacks specifically in the central nervous system.
The use of cocaine creates euphoria and high amounts of energy much like caffeine. if taken in large unsafe doses, it is possible to cause mood swings, paranoia, insomnia, psychosis, high blood pressure, tachycardia, panic attacks, cognitive impairments and drastic changes in personality.
Crack cocaine is the freebase form of cocaine that can be smoked. It may also be termed rock, work, hard, iron, cavvy, base, or just crack; it is said to be the most addictive form of cocaine, although this has been contested. Crack rocks offer a short but intense high to smokers. Crack appeared primarily in impoverished inner-city neighborhoods in New York, Los Angeles, and Miami in late 1984 and 1985.
In purer forms, crack rocks appear as off-white nuggets with jagged edges, with a slightly higher density than candle wax. Purer forms of crack resemble a hard brittle plastic, in crystalline form (snaps when broken). A crack rock acts as a local anesthetic (see: cocaine), numbing the tongue or mouth only where directly placed. When smoked, crack can leave the tongue numb where the smoke enters the mouth.]citation needed[ Purer forms of crack will sink in water or melt at the edges when near a flame (crack vaporizes at 90 °C, 194 °F).