Editor’s Note: Today’s post comes from Thembisa Waetjen, professor of history at the University of Johannesburg, and is derived from her presentation at the Cannabis: Global Histories conference, which was held from April 19-20, 2018, at the University of Strathclyde, Glasgow. In it, she argues that international cannabis criminalization was, in part, the result of an appeal made by the South African government in 1923. But what lay behind that appeal? And what were its consequences, locally?
On 31 March last year, the Western Cape High Court of South Africa, in the case of Garreth Prince, ruled as constitutional the personal use of cannabis by an adult in a private dwelling, along with the possession, purchase or cultivation associated with such use. Reflecting liberalizing trends in other parts of the world, this outcome signaled a shift in South Africa’s punitive drugs policy.
Many people don’t know that African countries, specifically Egypt and South Africa, played a crucial role in international cannabis criminalization in the early 20th century. In 1923, the office of Prime Minister Jan Christiaan Smuts requested that the League of Nations include Cannabis Sativa and Cannabis Indica on the list of ‘dangerous drugs’, to be regulated by global narcotics law. He explained:
“… from the point of view of the Union of South Africa, the most important of all the habit-forming drugs is Indian Hemp or ‘Dagga’.” 
What was the local story behind this appeal?