Following a survey of those arrested in 5 areas (Bennett, 1998).

Key results are as follows:

61% had taken at least one illegal drug.
46% were tested positive for cannabis.

Nearly half the arrestees across all five areas said their drug use was connected with their offending.

32% of the total illegal income of all these arrestees was spent on drugs.

The average illegal income for a heroin/crack user was 10-20,000.

Hard drugs such as heroin and cocaine, are estimated to be used by 2% of the population.

Cannabis is the most commonly used drug.

Denmark has highest overall use of cannabis.

UK figures for annual drug arrests