Crank refers to any form of methamphetamine.
Ice is a clear, crystallized, smokeable chunk of methamphetamine that produces a more intense reaction than cocaine or speed. Methamphetamines stimulate the central nervous system, and the effects may last anywhere from eight to 24 hours. Crank and ice are extremely addictive and produce a severe craving for the drug. In addition to the physical effects, the production and processing of methamphetamines also is dangerous. The ignitable, corrosive, reactive, and toxic nature of chemicals used to produce the drugs can cause explosions, fires, toxic fumes, and damage to health and environment.