A League of Nations report estimates 200 million cannabis users

In 1934, a report prepared for the League of Nations’ Opium Advisory Committee estimated that there were at least 200 million cannabis users worldwide. Historian Haggai Ram notes that the basis of the figure remains unclear. It belongs to the history of official claims about cannabis, rather than a verified global prevalence series.

The estimate helped frame cannabis as an international problem requiring further investigation. That framing mattered because earlier League discussions had largely treated hashish as a concern of particular Asian and African societies.

Beyond a regional picture

The 1925 Opium Convention had already introduced international cannabis controls. It did not require every country to prohibit domestic use, but it placed cannabis within the machinery of international drug regulation.

Ram contrasts the 1934 estimate with a 1932 committee account that described the hashish trade principally through Egypt and neighbouring regions. The later figure suggested a much wider population of consumers, without providing a transparent way to measure them.

A number without a demonstrated method

A figure of 200 million could imply urgency and scale. Without a documented denominator, definition of use, sampling procedure or calculation, however, it cannot establish how frequently those people consumed cannabis or which preparations they used.

Ram traces the estimate through James Mills’s historical research. The underlying report has not been independently examined for this article. The number is therefore attributed to the report as reconstructed by historians, rather than presented as a newly verified count.

Experts and inherited assumptions

The League turned to a cannabis subcommittee to assemble scientific, medical and legal knowledge. Ram describes experts whose experience often came from colonial administration in the Middle East and North Africa, while the populations they discussed had little voice in the proceedings.

The committee’s subsequent arguments exposed tensions within that knowledge. Some experts explained consumption through fixed racial or cultural characteristics; others challenged those generalisations. The 1938 exchange involving Russell Pasha shows that disagreement within the institutions of control.

What the report changed

The estimate supplied an alarming account of cannabis’s reach, not a new treaty obligation or national prohibition. Research and argument continued through the decade without resolving central questions about its effects.

The event is retained as international context. It moves no country’s score and is not used to calculate historical numbers of cannabis consumers.^[1]