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Crack cocaine is the freebase form of cocaine. Crack's popularity, in part, was due to its appeal for drug users seeking an inexpensive, ultra-potent, fast acting high.
However, crack cocaine is not water soluble and therefore cannot be snorted or injected. You must smoke it to feel the effects.
Tolerance occurs when your body adapts to the crack cocaine in your system and requires greater amounts of it to have the same effect. If you are no longer satisfied with a small amount of crack and feel a need for larger and larger amounts, you have built a tolerance.