The National Treatment Agency for Substance Misuse (NTA) said 23,905 under-18s in England were helped with drug and alcohol problems in 2007-08, compared with 17,001 two years before.
Four out of five of all young people receiving specialist help or counselling were treated for problems with cannabis or alcohol, the agency added.
The report was published as other figures showed that more than one in three British adults drinks more than the recommended daily alcohol limit at least one day a week. Data from the Office for National Statistics (ONS) showed that one in five adults consumed more than double that limit on the day of drinking most.
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