Explain the different preparations of cocaine and how they are used

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Coca paste is produced after soaking, mixing, and mashing coca leaves in an organic substance and after excess liquid is filtered out. In South America, this is often mixed with tobacco and smoked. Cocaine hydrochloride is a salt that mixes easily in water and is so stable that it cannot be heated to form vapors for inhalation. This is either sniffed through the nose or injected intravenously. Freebase is made by extracting cocaine into a volatile organic solvent, such as ether. It can then be smoked, but this is dangerous because of the combination of fire and ether fumes. Crack or rock can be created by combining cocaine with simple household chemicals, like baking soda and water, and then drying it. The resulting lump can be smoked.