Opiates are one of the most addictive drugs with sedative and analgesic effects, which depress the central nervous system. According to the TEDS report, opiates are the primary substance of abuse and accounted for almost one-fifth (19 percent) of all substance abuse treatment admissions in 2007. Some common opiates are morphine, codeine and heroin, of which heroin is the major illegal drug. According to NSDUH, there were about 114,000 persons aged 12 or older who used heroin for the first time within the past 12 months in 2008.

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