3.2 million people in the United Kingdom used at least one illicit drug in 2008, according to the British Crime Survey.
Selected breakdown on the drug users in the UK:
974,000 people used Cocaine.
586,000 people used Ecstasy.
2.5 million people smoked Marijuana.
125,000 people used Ketamine.
Source: Alan Travis, “Home Office reports big rise in cocaine use as street price falls,” Guardian, July 23, 2009.