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Rates of Drug Dependence in the United States
This graph depicts the rates of drug dependence/abuse in the United States. As you can see, alcohol tops the list, followed by marijuana, and then pain relievers such as Vicodin and Oxycontin. The sedatives category includes barbiturates, which are powerful nervous system depressants.
Source: National Institute on Drug Abuse, 2012; (photo) © Alec Macdonald/Alamy