Cannabis in Sub-Saharan Africa in the 1920s: Prohibition, Not Legalization

Setting the record straight

There is a persistent claim circulating online that Sub-Saharan African countries pursued cannabis legalization in the 1920s. The historical record does not support this No data. The 1920s were, in fact, the decade in which cannabis prohibition was consolidated across the region under colonial rule and formalized at the international level.

Cannabis (known regionally as dagga, bhang, diamba, or liamba) had been cultivated and consumed in parts of Africa for centuries before European colonization ^[1]. But the political action of the 1920s moved uniformly in one direction: toward criminalization, not legalization.

South Africa leads the push for prohibition

The single most consequential event of the 1920s for African cannabis policy came from the Union of South Africa. In 1922, South Africa banned the cultivation, sale, and possession of cannabis under Government Notice 2244 ^[2] Strong evidence.

In 1923, the South African government formally requested that the League of Nations add cannabis ("Indian hemp") to the list of internationally controlled narcotics, arguing it was as dangerous as opium ^[3] Strong evidence. Prime Minister Jan Smuts's government framed the issue partly in racial terms, associating cannabis use with African and Indian laborers — a framing well documented by historians of drug policy ^[1][4].

This was not an isolated national decision. South Africa's diplomatic push directly shaped the international treaty regime that followed.

The 1925 Geneva Convention

At the Second International Opium Conference in Geneva (1924–1925), Egypt — supported by South Africa and Turkey — pushed for cannabis to be included in the international narcotics control regime. The resulting International Opium Convention of 1925 added "Indian hemp" (cannabis) to the schedule of controlled substances ^[5] Strong evidence.

The treaty required signatory states to restrict cannabis to medical and scientific purposes and to control international trade. Britain, France, Belgium, Portugal, and other colonial powers who signed the convention were then obligated to enforce these controls across their African territories. This is the mechanism by which prohibition spread across Sub-Saharan Africa during the second half of the decade ^[1].

Colonial cannabis laws across the region

Prohibition rolled out unevenly but consistently through the 1920s:

• Southern Rhodesia (now Zimbabwe) restricted dagga under earlier ordinances that were tightened in the 1920s ^[1].
• Kenya and other British East African territories applied restrictions under Dangerous Drugs Ordinances following the 1925 convention [evidence:weak — precise dates vary by territory and are not always well documented in secondary literature].
• The Belgian Congo had criminalized diamba smoking as early as 1903 and maintained those prohibitions through the 1920s ^[1].
• French West and Equatorial Africa brought cannabis under narcotics regulation following France's ratification of the 1925 convention ^[1].
• Portuguese Angola and Mozambique had documented restrictions on liamba use dating to the 19th century, reinforced during this period ^[1].

Enforcement was often patchy and concentrated in urban areas, mining compounds, and among migrant laborers. Rural traditional use frequently continued in practice, but it was now legally prohibited.

Where the 'legalization' myth may come from

A few possible sources for the misconception that Africa was legalizing cannabis in the 1920s Anecdote:

1. Confusion with cultivation traditions. Because cannabis was widely and openly grown in many African societies before prohibition, casual readers sometimes assume it was "legal" in a modern regulatory sense. In reality, it was simply un-regulated by the state — a very different thing from an active legalization policy.
2. Confusion with modern reforms. South Africa's Constitutional Court decriminalized private adult cannabis use in 2018, and countries like Lesotho, Zimbabwe, Malawi, and Rwanda have licensed medical or industrial cannabis in the 2010s–2020s ^[6]. These modern reforms are sometimes mis-dated in online sources.
3. Conflation with the U.S. and hemp debates. The 1920s U.S. debate over the Volstead Act and later the 1937 Marihuana Tax Act sometimes gets geographically scrambled in secondary retellings.

None of this changes the core fact: the 1920s in Sub-Saharan Africa were about criminalization, not legalization.

Key figures and takeaways

Jan Smuts (South African Prime Minister, 1919–1924) — presided over the 1922 ban and the 1923 diplomatic push at the League of Nations ^[3].

Mohamed El Guindy (Egyptian delegate) — the most vocal proponent of adding cannabis to the 1925 Geneva Convention, backed by South African delegates ^[5].

Takeaway for readers: If you're researching African cannabis history, the 1920s are the origin decade of prohibition, not legalization. The story of legalization in Africa begins in the 21st century, not the 20th. For that history, see Cannabis Legalization in South Africa and Lesotho's Medical Cannabis Program.

Sources

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