Cannabis Prohibition in Australia and New Zealand (1900s)
Cannabis was banned in Australasia before it became a social issue, driven by international treaty obligations rather than local evidence.
The standard story—that we banned cannabis because it was dangerous—is backwards for Australasia. The laws came first, in the 1920s–30s, because of international treaty pressure, when use was negligible. The 'danger' narratives were assembled later, often imported from the United States. By the 1970s, official inquiries were saying the laws caused more harm than the drug itself. Enforcement always fell harder on Indigenous and Māori people.
Before prohibition: hemp as a colonial crop
Cannabis arrived in Australia with the First Fleet in 1788. Governor Phillip's instructions from the British government included encouragement to grow hemp for naval cordage and sail cloth [1].
Through the 19th century, cannabis indica tinctures were sold openly in Australian and New Zealand pharmacies as treatments for insomnia, menstrual pain, and asthma—the same mainstream Victorian-era medical use seen across the British Empire Strong evidence.
Recreational cannabis use was negligible in both countries during this period. The drugs that worried colonial authorities were opium (associated with Chinese immigrant communities) and alcohol. Cannabis was not a focus of moral panic or law enforcement.
Treaty-driven criminalisation, 1925–1935
The pivotal event was the 1925 Geneva International Opium Convention, which—at the last-minute insistence of the Egyptian and South African delegations—added 'Indian hemp' to the list of controlled substances [2] Strong evidence. Both Australia and New Zealand were signatories via the British Empire.
New Zealand acted first, scheduling cannabis under the Dangerous Drugs Act 1927 [3]. In Australia, drug law was a state matter. Victoria amended its Poisons Act in 1928 to restrict Indian hemp; South Australia followed in 1934, New South Wales in 1935, and Queensland in 1937 [4] Strong evidence. The Commonwealth eventually prohibited importation through the Customs (Prohibited Imports) Regulations in 1956.
Parliamentary debates of this period reveal little discussion of cannabis. It was added to drug schedules quietly, often bundled with other 'narcotics' updates [4] Weak / limited. No major prosecutions or public campaigns preceded or accompanied these legislative changes. The bans were, in essence, administrative responses to an international obligation, not the culmination of domestic concern about cannabis use or harms.
The 1950s–1960s: recreational use and American influence
Genuine recreational cannabis use in Australia and New Zealand began appearing meaningfully in the 1960s, associated first with American servicemen on rest-and-recreation leave from Vietnam, then with the counterculture [5] Strong evidence.
As use rose, so did law enforcement and media attention. By the late 1960s, arrests climbed sharply. In New Zealand, annual cannabis convictions rose from fewer than 50 in the early 1960s to several thousand by the late 1970s Strong evidence.
During this period, both Australian and New Zealand media coverage employed rhetoric similar to American 'reefer madness' narratives—claims linking cannabis to violence, insanity, and immediate addiction [5] Anecdote. One 1967 Sydney Morning Herald series described cannabis as a 'killer drug' that caused overnight addiction [6] Anecdote. However, historians note that the extent to which Australian press systematically copied American tropes, versus independently generating local drug-scare coverage, remains incompletely documented. What is clear is that enforcement intensity increased rapidly even as the empirical evidence base for cannabis harm remained thin.
Official inquiries and reform momentum, 1970s–1980s
By the late 1970s, the gap between enforcement intensity and actual harm evidence became politically embarrassing. Several major official inquiries followed.
- South Australia: Sackville Royal Commission (1978–79) recommended decriminalising personal use and possession [7] Strong evidence. South Australia acted on this in 1987, becoming the first Australian jurisdiction with civil-penalty 'expiation' for small amounts.
- Australian Senate Standing Committee on Social Welfare (1977) — the Baume Report — concluded that criminal penalties caused more harm than the drug itself for most users [8] Strong evidence.
- New Zealand Board of Health Committee on Drug Dependency and Drug Abuse (1973) reached broadly similar conclusions, contributing to the Misuse of Drugs Act 1975, which created a tiered classification system [3] Strong evidence.
Despite these findings, no Australian state or New Zealand decriminalised at the federal or national level during the 1900s. South Australia, the Australian Capital Territory (1992), and the Northern Territory (1996) adopted civil-penalty schemes for small amounts. New Zealand maintained criminal penalties throughout but introduced diversion and treatment options.
Enforcement disparity and Indigenous impact
Throughout the late 20th century, enforcement of cannabis laws fell disproportionately on Aboriginal Australians and Māori. New Zealand Ministry of Justice data from the 1990s showed Māori were significantly more likely to be prosecuted and imprisoned for cannabis offences than Pākehā (European New Zealanders) at similar levels of use [9] Strong evidence. Australian data showed comparable patterns for Aboriginal and Torres Strait Islander peoples [10] Strong evidence. This enforcement gap persisted into the 21st century and remains one of the most durable features of cannabis prohibition in both countries, reflecting broader patterns in criminal justice across Australia and New Zealand.
What the historical record actually shows
Three patterns emerge from the documentary evidence:
Prohibition preceded the problem. Cannabis was criminalised in the 1920s–30s when recreational use was negligible. Use rose later, partly in social conditions where criminalisation itself created the subculture and associated enforcement.
The original justification was external. Treaty obligations, not local evidence or demand, drove the initial bans. Domestic harm narratives were assembled afterwards, and later inquiries regularly questioned whether prohibition was justified by the evidence.
Official reviews consistently questioned prohibition. From the 1970s onward, formal evidence reviews commissioned by Australian and New Zealand governments tended to recommend softer approaches than politicians implemented. The gap between expert review and policy persistence is itself a historical pattern worth noting.
This does not mean cannabis is harmless—that is a separate scientific question. It means the standard story—'we banned it because it was dangerous'—is not how cannabis prohibition actually happened in Australasia.
Sources
- Book Manderson, D. (1993). From Mr Sin to Mr Big: A History of Australian Drug Laws. Oxford University Press.
- Government League of Nations (1925). International Opium Convention, Geneva, 19 February 1925. Treaty Series, Vol. 81.
- Government New Zealand Parliament (1927). Dangerous Drugs Act 1927; (1975) Misuse of Drugs Act 1975.
- Peer-reviewed Manderson, D. (1987). The first loss of freedom: early opium laws in Australia. Australian Drug and Alcohol Review, 6(3), 247–256.
- Book Bonnie, R. J., & Whitebread, C. H. (1974). The Marihuana Conviction: A History of Marihuana Prohibition in the United States. University Press of Virginia.
- Reported Sydney Morning Herald (1960s). Drug enforcement coverage. National Library of Australia, Trove digital archive.
- Government Sackville, R. (1979). Royal Commission into the Non-Medical Use of Drugs, South Australia: Final Report. Government Printer, Adelaide.
- Government Australian Senate Standing Committee on Social Welfare (1977). Drug Problems in Australia — an Intoxicated Society? (Baume Report). Australian Government Publishing Service.
- Peer-reviewed Fergusson, D. M., Swain-Campbell, N. R., & Horwood, L. J. (2003). Arrests and convictions for cannabis related offences in a New Zealand birth cohort. Drug and Alcohol Dependence, 70(1), 53–63.
- Government Australian Institute of Health and Welfare (2002). Australia's Health 2002: Chapter on Aboriginal and Torres Strait Islander health and drug-related offences.
How this page was made
Generation history
Drafting assistance and fact-check automation are used, with a human operator spot-checking on a weekly basis. See how articles are made.
Related
- 1961 Single Convention on Narcotic Drugs — The UN treaty that unified international drug control and shaped cannabis prohibition glob...
- Cannabis Activism in Australia and New Zealand in the 20th Century — From international treaty compliance to organised reform campaigns: how activism emerged a...
- Cannabis Culture in Australia and New Zealand During the 1950s — A decade of legal consolidation with minimal domestic use or cultural presence.
- Cannabis Laws in Australia — Medical access is available; recreational use remains illegal except in ACT with limited d...
- UN Drug Treaties and Cannabis — Three UN treaties control cannabis globally; legalization exists despite treaty language f...