A mixture of cocaine and heroin.
- Study participants were asked separate questions about their use of crack cocaine, powder cocaine, heroin, speedball, methadone, other opiates, amphetamine, marijuana, and a catch-all ‘other drugs’ category.
- For heroin, this included snorting, injecting, smoking, and the use of speedballs (heroin and cocaine combined).
- Drug use frequency is measured as no use, marijuana use (so-called ‘light’ drug), and crack, cocaine, heroin, speedball and/or methamphetamines.
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