Cannabis is by far the most widely cultivated, trafficked, and abused illicit drug.
Half of all drug seizures worldwide are cannabis seizures. The geographical spread of those seizures is also global, covering practically every country of the world.
About 147 million people, 2.5% of the world population, consume cannabis (annual prevalence) compared with 0.2% consuming cocaine and 0.2% consuming opiates.
In the present decade, cannabis abuse has grown more rapidly than cocaine and opiate abuse. The most rapid growth in cannabis abuse since the 1960s has been in developed countries in North America, Western Europe, and Australia. Cannabis has become more closely linked to youth culture and the age of initiation is usually lower than for other drugs.

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Adapted from World Health Organization. Management of substance abuse. Facts and figures. Internet. Available at http://www.who.int/substance_abuse/en/. Accessed on June 19, 2018.