The League of Nations and Cannabis

Background: drug control before 1925

International drug control began with the 1909 Shanghai Opium Commission and the 1912 Hague International Opium Convention, both focused on opium, morphine, and cocaine. Cannabis was not part of the original agenda. The Hague Convention mentioned 'Indian hemp' only in a resolution asking governments to 'study the question' — it imposed no obligations ^[1] Strong evidence.

When the League of Nations was established in 1920, it inherited responsibility for drug control through its Advisory Committee on the Traffic in Opium and Other Dangerous Drugs (the 'Opium Advisory Committee'). The committee's main concern was the legitimate and illicit trade in opiates and cocaine. Cannabis sat at the margins ^[2] Strong evidence.

The 1923–1924 lead-up: Egypt and South Africa raise hashish

In 1923, South Africa formally asked the League to treat 'Indian hemp' as a habit-forming drug subject to international control. Egypt followed with similar requests, framing hashish as a major domestic social problem and linking it — without strong evidence — to insanity and crime ^[3] Weak / limited.

The characterization of cannabis as a cause of insanity drew heavily on colonial-era reports. The single most cited counter-evidence at the time, the 1894 Indian Hemp Drugs Commission Report, had concluded that moderate use of cannabis produced no significant physical, mental, or moral injury ^[4] Strong evidence. The 1925 negotiations largely ignored this finding.

The 1925 Geneva Conference

The Second Opium Conference opened in Geneva in November 1924. Cannabis was not on the formal agenda. On 8 December 1924, the Egyptian delegate Mohamed El Guindy delivered a now-famous speech arguing that hashish was 'at least as harmful as opium, if not more so,' claiming that approximately 30–60% of cases of insanity in Egypt were caused by hashish use ^[3][5] Disputed. These figures were not derived from controlled study; they reflected admissions data from Egyptian asylums where 'hashish insanity' was a common diagnostic category of the era.

The Indian delegation, representing British India where bhang, ganja and charas were taxed and regulated rather than prohibited, resisted strict controls. The British delegation was cautious. After negotiation, a compromise was reached: a new sub-committee on cannabis was convened, and cannabis was added to the convention with weaker controls than opium ^[6] Strong evidence.

The International Opium Convention was signed at Geneva on 19 February 1925. It defined 'Indian hemp' as the dried flowering or fruiting tops of the female plant of Cannabis sativa L. from which the resin had not been extracted. It prohibited the export of Indian hemp to countries that had banned its use, required import certificates, and restricted use to 'medical and scientific purposes' — but notably exempted the leaves and did not prohibit domestic cultivation or non-medical use outright ^[7] Strong evidence.

What the Convention actually did — and didn't — do

The 1925 Convention did not ban cannabis globally. It did:

• Add 'Indian hemp' and cannabis resin to the international drug control schedule.
• Require parties to control international trade through a system of import/export certificates.
• Restrict legal trade to 'medical and scientific' purposes.

It did not:

• Criminalize possession or use.
• Ban cultivation.
• Cover cannabis leaves (a gap exploited for decades in places like India and the Caribbean).
• Reflect any new scientific study commissioned by the League ^[7] Strong evidence.

The United States, frustrated that the Convention was too weak on opiates, refused to sign. The convention entered into force on 25 September 1928 ^[2] Strong evidence.

The Sub-Committee on Cannabis (1935–1940)

After 1925, the League's Opium Advisory Committee created a Sub-Committee on Cannabis that met intermittently through the 1930s. It collected national reports, debated definitions, and explored further restrictions. Its work was interrupted by the Second World War and the dissolution of the League ^[2] Strong evidence.

Notably, the sub-committee never produced a body of original scientific research on cannabis comparable to, say, the later LaGuardia Committee Report (1944) in New York. It largely aggregated government submissions, many of which simply restated existing prohibitionist positions.

Legacy: from Geneva 1925 to the 1961 Single Convention

When drug control passed from the League to the United Nations after 1946, the 1925 framework carried over. The 1961 Single Convention on Narcotic Drugs consolidated earlier treaties and placed cannabis in Schedule I and Schedule IV — the most restrictive categories — without commissioning new scientific review at the time ^[8] Strong evidence.

The consequence is that much of the legal architecture used to justify cannabis prohibition worldwide rests on a 1925 diplomatic compromise driven by one country's domestic politics and colonial-era psychiatric statistics, not on a deliberative scientific finding. This is one reason the WHO's 2019 recommendation to remove cannabis from Schedule IV — accepted by the UN Commission on Narcotic Drugs in December 2020 — was historically significant: it was, in some sense, the first time the international system formally revisited the 1925 assumption ^[9] Strong evidence.

Common myths

Myth: The League of Nations scientifically studied cannabis and found it dangerous. False. No original League-commissioned scientific study underpinned the 1925 decision Strong evidence.

Myth: The 1925 Convention banned cannabis. False. It restricted international trade and required medical/scientific use, but did not criminalize possession or cultivation Strong evidence.

Myth: El Guindy's '70% of insane Egyptians are hashish users' statistic is established fact. It is widely cited but never rigorously validated; it reflected asylum diagnostic culture, not epidemiology Disputed.

Myth: The U.S. drove the inclusion of cannabis in 1925. False. The U.S. delegation walked out over opiate controls. Egypt — not the U.S. — pushed cannabis onto the agenda Strong evidence.

Sources

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