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22.5 million Americans
aged 12 or older in 2004 were classified with past year
substance dependence or abuse (9.4 percent of the
population), about the same number as in 2002 and 2003.
Of these, 3.4 million were classified with dependence on
or abuse of both alcohol and illicit drugs, 3.9 million
were dependent on or abused illicit drugs but not
alcohol, and 15.2 million were dependent on or abused
alcohol but not illicit drugs.
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