Australia and New Zealand has been ranked as the highest users of illegal drugs in the world. According to a study up to 15 per cent of 15 to 64-year-olds have used the drug at least once in the past year.
The study also found that more than 200 million people in the world use illicit drugs, with those in wealthier countries most likely to abuse such substances.
AdvertisementStudy co-author Louisa Degenhardt, of the National Drug and Alcohol Research Centre in Australia, said the popularity of illicit drugs was linked to cost and supply.
"There's more that we need to understand about that, but we think that, particularly for occasional users, if drug prices go up then their level of use goes down," the Herald Sun quoted Prof Degenhardt as saying.
The study is one of three in a series about addiction to be published in The Lancet.
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