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The survey found that an estimated 23.9 million Americans – 9.2 percent of the population – had used an illicit drug during the month prior to the survey interview. This represented increase from the 22.2 million (8.5 percent) last surveyed. Illicit drugs include marijuana/hashish, cocaine (including crack), heroin, hallucinogens, inhalants or prescription-type psychotherapeutics (pain relievers, tranquilizers, stimulants and sedatives) used non-medically.
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