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Crack cocaine ârocksâ. Crack cocaine is the freebase form of cocaine that can be smoked. It may also be termed rock, work, hard, iron, cavvy, base, but is most commonly known as just crack; the Manual of Adolescent Substance Abuse Treatment calls it the most addictive form of cocaine.Crack rocks offer a short but intense high to smokers.he short-term physiological effects of cocaine include constricted blood vessels, dilated pupils, and increased temperature, heart rate, and blood pressure. Some users of cocaine report feelings of restlessness, irritability, and anxiety.
Two methods are commonly suggested. (Doesn't work very well) or if mode I fracture dominates the other mode: (Doesn't work at all) Caution: Just because a crack is presence doesn't mean that a sample will fail in fracture. It also doesn't mean that the other mode of failure will occur in the vicinity of the crack.