Cannabis is the most widely used illicit drug in the world, with New Zealanders and Australians reported to be leading the world in using it.
The United Nations says in its latest global report on drug use and trafficking that between 9.1 and 14.6 percent of the New Zealand and Australian populations use the drug, compared to the estimated annual worldwide usage of 2.6 to 5.0 percent.
In New Zealand, the UN reported that a decrease in the use of Ecstasy is reported to have been offset by the use of other substances mimicking its effects, including piperazines, cathinone and mephedrone.
Australia and New Zealand, together with North America and Europe, remain major markets for cocaine, with the latest data pointing to an increase in Australian cocaine use.
"There was an increase in cocaine use reported in Oceania from an estimated 1.4 to 1.7 percent in 2009 to 1.5 to 1.9 percent in 2010, essentially reflecting the increase in cocaine use in Australia, whereas cocaine use remained stable in Western and Central Europe," the report said.
The UN Office on Drugs and Crime (UNODC) report, based on 2010 data, noted a global increase in the use of pharmaceuticals for non-medical purposes, which climbed from 3.7 percent in 2007 to 4.2 percent in 2010.
The UNODC also reported "new synthetic psychoactive substances" chemically engineered to remain outside international control are being increasingly used.
All regions, particularly Europe, North America and Oceania, reported the use of these substances "as an emerging trend".
NZN