Cocaine is a fine white or off-white powder that acts as a powerful stimulant. In its pure form, cocaine is extracted from the leaves of the coca plant. On the street, it can be diluted or "cut" with other substances to increase the quantity. Crack is cocaine that has been further processed with ammonia or sodium bicarbonate (baking soda) and looks like small flakes or rocks.
Prevalence rates for lifetime use of cocaine are typically between one and three per cent in developed countries, with higher rates in the United States and in th