Humans have been consuming cannabis since prehistory,although in the 20th century there was a rise in its use for recreational, religious or spiritual, and medicinal purposes. It is estimated that about 4% of the world's adult population use cannabis annually and 0.6% daily.
The possession, use, or sale of psychoactive cannabis products became illegal in most parts of the world in the early 20th century. Since then, some countries have intensified the enforcement of cannabis prohibition while others have reduced the priority of enforcement.

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