It was estimated more than eight per cent of the population used marijuana at least once a year, and this rate was only matched by North America and our trans-Tasman neighbours."Australia, New Zealand and North America have traditionally been the countries which have among the highest rates (of cannabis use)," Professor Louisa Degenhardt of the University of NSW said. "That has been something demonstrated repeatedly in surveys of young people and surveys of the general population."
Europe was next in terms of annual usage followed by the Middle East and Asia, while usage rates were rising across Africa but from a low base in some countries.
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