| http://www.w3.org/ns/prov#value | - ???In the past, heroin was a drug that introduced people to narcotics,??? said principal investigator Theodore J. Cicero, Ph.D. ???But what we???re seeing now is that most people using heroin begin with prescription painkillers such as OxyContin, Percocet or Vicodin, and only switch to heroin when their prescription drug habits get too expensive.???
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