Cannabis Culture in South America During the 1930s

Background: How Cannabis Got There

By 1930, cannabis had been present in South America for roughly three centuries. The dominant historical account traces its arrival in Brazil to enslaved Africans transported during the Atlantic slave trade, with the Portuguese-language word maconha derived from Kimbundu and related Bantu terms ^[1][2]. A parallel introduction occurred through Indian indentured laborers arriving in the Guianas and Caribbean in the 19th century, which is why Guyanese and Surinamese usage still tracks Hindi ganja rather than Bantu-derived words ^[2].

By the early 20th century, cannabis smoking was concentrated in the Brazilian Northeast — particularly Bahia, Pernambuco, Alagoas, and Maranhão — and among sailors, dock workers, and rural laborers in port cities. It was not a middle-class habit, and this class dimension shaped everything that happened next Strong evidence.

Brazil: Psychiatry, Race, and the Road to Prohibition

The 1930s in Brazil were dominated by two figures in the anti-cannabis campaign: Dr. Rodrigues Doria and Dr. Pernambuco Filho. Doria had already published his influential 1915 paper Os fumadores de maconha: efeitos e males do vício ("Maconha smokers: effects and evils of the vice"), which explicitly linked cannabis use to Black Brazilians and framed it as an African contamination of national health ^[1][3]. That framing dominated 1930s Brazilian medical discourse.

In 1932, cannabis was formally listed as a prohibited substance in federal drug regulations. The decisive law came in Decree-Law 891 of November 25, 1938, signed under Getúlio Vargas's Estado Novo dictatorship, which criminalized planting, cultivation, harvest, and trafficking of Cannabis sativa and aligned Brazilian law with the 1936 Geneva Convention for the Suppression of the Illicit Traffic in Dangerous Drugs ^[4] Strong evidence.

Enforcement in the 1930s was uneven but heavily concentrated on Afro-Brazilian communities, Candomblé terreiros, and sailors. Police raids in Salvador and Recife are documented in period newspapers and later reconstructed by historians such as Jorge Emanuel Luz de Souza and Henrique Carneiro ^[1][3].

Brazil at the League of Nations

Brazil punched above its weight at the League of Nations Opium Advisory Committee. In 1935, the Brazilian delegate Pernambuco Filho submitted a memorandum titled Les maladies produites par le 'maconha' to the Committee, arguing that Brazilian cannabis ("maconha") was more dangerous than Indian hashish and calling for international suppression ^[5]. The document is preserved in League of Nations archives in Geneva.

This matters because it is one of the earliest examples of a Latin American state actively exporting a prohibitionist frame — rather than merely receiving it from the U.S. or Egypt (whose delegate El Guindy had famously pushed cannabis onto the 1925 Geneva Convention). The 1930s Brazilian medical establishment saw international drug control as a way to demonstrate modernity and public-health seriousness ^[3] Strong evidence.

Argentina, Uruguay, and the Rest of the Continent

Documentation outside Brazil is thinner. Argentina included cannabis in its 1926 penal code amendments and Law 11.331 (1926) criminalizing narcotics, but 1930s enforcement focused overwhelmingly on cocaine and opiates; cannabis use appears to have been rare in Buenos Aires compared to Salvador Weak / limited.

Uruguay passed Law 9.692 in 1937, its first comprehensive narcotics law, which included cannabis on the controlled list ^[6]. This is the same country that would, 76 years later, become the first in the world to legalize adult-use cannabis — a historical irony worth noting.

Colombia, Peru, and the Andean countries in the 1930s were far more focused on coca leaf, which had established indigenous and industrial uses. Cannabis in Colombia's Caribbean coast (later famous for Santa Marta Gold) existed but attracted little state attention until the 1940s and 1950s Weak / limited. Claims you'll sometimes see online about specific 1930s "landrace" cultivars from Colombia or Panama are essentially retroactive marketing; there is no primary-source documentation of named strains from that decade.

Popular Culture and Music

The most durable cultural artifact from this period is a body of Brazilian songs referencing maconha and diamba. The best-known is "Erva de Jurema" and the sambas and coco rhythms of the Northeast, some of which mention cannabis obliquely. The 1933 recording "Fumo de Rolo" and other tobacco-adjacent songs sometimes get retroactively described as cannabis references — that's partly true, partly folklore Disputed.

What is well-documented: cannabis was tied to Afro-Brazilian religious practice in some Candomblé and Catimbó houses, though this was neither universal nor central. The idea that Candomblé is fundamentally a "cannabis religion" is a modern misreading. Ritual use existed but was one thread among many ^[1] Weak / limited.

Myths About the Decade

Three claims about 1930s South American cannabis circulate widely and deserve pushback:

1. "Landrace strains were being carefully bred by farmers." No primary evidence supports organized breeding programs in this era. Cannabis in 1930s Brazil and Colombia was grown from saved seed by subsistence farmers; consistent phenotypes emerged from isolation and selection pressure, not intentional cultivar development No data.

1. "Prohibition came from the United States." Partly true for the 1961 Single Convention era, but in the 1930s Brazilian prohibition was driven primarily by Brazilian psychiatrists using racial-hygiene arguments, with the League of Nations (not the U.S. Federal Bureau of Narcotics) as the main international forum ^[3][5].

1. "Cannabis was legal and normal until Vargas banned it." Also misleading. Municipal ordinances in Rio de Janeiro banned pito de pango (cannabis pipes) as early as 1830, and state-level prohibitions existed before federal law ^[1]. The 1938 decree consolidated rather than invented prohibition.

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