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For a number of years, the needle exchange program has been giving crack injectors citric acid to use in their injections rather than vinegar, which produces "horrible abscesses", says the administrator. "But regardless, a crack injection is going to burn your veins."

: "Crack cocaine is being injected - not just smoked - by a significant number of US drug users, reveals the first large survey of the practice. The phenomenon is particularly worrisome because it is associated with more high-risk behaviour, such as sharing needles and having unprotected sex, than other intravenous drugs."