One in 25 people try cannabis: study

Thu Oct 15, 2009 10:47pm EDT
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HONG KONG (Reuters Life!) - An estimated 166 million people worldwide have either tried using cannabis or are active users of the drug despite scientific research showing its adverse effects on health, two researchers in Australia said.

The figure, taken from the United Nations Office on Drugs and Crime (UNODC), means one in every 25 people between the ages 15 and 64 in 2006 had had some experience with the drug, the researchers wrote in a paper published in The Lancet.

The paper is written by Professor Wayne Hall at the School of Population Health in the University of Queensland in Brisbane and Professor Louisa Degenhardt at the National Drug and Alcohol Research Center in the University of New South Wales in Sydney.

It contains findings of the UNODC and a review of medical literature published over the past 10 years on the adverse effects of cannabis on human health.

Cannabis use was highest in the United States, Australia and New Zealand, followed by Europe. Because of their large populations, 31, 25 and 24 percent of the world's cannabis users were from Asia, Africa, and the Americas respectively, with Europe accounting for 18 percent and Oceania 2 percent.

Australia and New Zealand had the highest use, or more than 8 percent of the population aged 15-64. But use was declining in both places, the researchers said, adding that similar trends were seen in Western Europe.

In contrast, cannabis use was increasing in some low- and middle-income countries, such as those in Latin America and several countries in Africa.

The paper cited North American research showing that 10 percent of people who had had contact with cannabis became daily users, while 20 to 30 percent became weekly users.

Cannabis use typically began in teenage years, peaking in the early- and mid-20s, before declining as young people entered full-time employment, got married and had children.   Continued...