From Prohibition to Legalisation: How Cannabis Law Changed Around the World, and What the Record Actually Shows
A neutral map of how cannabis law is written today, what the outcome research can and cannot tell us, and why the words used to describe these laws are so often wrong.
1. How to read this article
Members here live under very different laws: some where cannabis is a regulated product, others where possession carries years in prison. Nothing below recommends any course of action, or implies reform is inevitable or prohibition irrational.
Most material rests on encyclopaedic reference pages, which go stale quickly, so read every status as described by the source and possibly out of date. Two stronger sources are preferred where they overlap: a 2025 European drug agency report and a law-firm analysis of a 2025 United States statute.
2. The international prohibition architecture
The 1961 convention and what it obliges
Almost every national cannabis law sits inside the Single Convention on Narcotic Drugs of 1961, which obliges states to “limit exclusively to medical and scientific purposes the production, manufacture, export, import, distribution of, trade in, use and possession of drugs”.
Cannabis, resin, extracts and tinctures sat in Schedule I from the outset; cannabis and resin were also in Schedule IV, the most restrictive category. The 1971 Convention on Psychotropic Substances and the 1988 convention against illicit traffic extended the system. One nuance is often missed: the penal provisions are ambiguous about whether personal possession must be criminalised, and that ambiguity is where decriminalisation has operated. It is far narrower than a commercial market needs.
Administration, and the December 2020 vote
The Commission on Narcotic Drugs moves substances between schedules on World Health Organization findings; the International Narcotics Control Board limits each country’s production to declared medical need.
On 2 December 2020 the Commission withdrew cannabis and resin from Schedule IV, effective April 2021. What it did not do matters more: cannabis stayed in Schedule I and the medical-and-scientific obligation was untouched. It eased a scheduling classification; it did not authorise recreational markets. The source gave no vote counts, so none are given.
3. Five models that casual writing confuses
Coverage routinely says a country has “legalised” when it has done something far narrower. The difference decides whether a person may buy, a business may sell, and a visitor is committing a crime.
| Model | What changes | What stays illegal |
|---|---|---|
| Decriminalisation | Possession below a threshold becomes a minor offence | Production, supply, sale |
| Medical access | Prescribed patients obtain specified products | Non-prescribed possession; recreational sale |
| Home cultivation | A household may grow a few plants for itself | Sale; usually public possession |
| Non-profit associations | Members collectively grow and receive limited amounts | Commercial sale; supply to non-members |
| Commercial adult sale | Licensed businesses sell to adults, taxed | Unlicensed sale; sale to minors |
4. Uruguay and Canada
Uruguay
Law 19.172, signed on 23 December 2013 by President José Mujica, made Uruguay the first country in the modern era to legalise; pharmacy sales began only in 2017, with sixteen authorised pharmacies. A consumer must be Uruguayan, at least 18, registered in a national database, and must pick one route: pharmacy purchase capped at 40 grams a month, home growing of up to six crops a year not exceeding 480 grams, or a club growing 99 plants a year for 15 to 45 members. Foreigners may not buy.
Canada
The Cannabis Act, introduced as Bill C-45, took effect on 17 October 2018; medical access predated it under 2001 regulations. Ottawa licenses producers while provinces set distribution, retail model and minimum age. Adults may possess 30 grams in public and grow four plants, though Quebec and Manitoba announced they would not permit home growing. Minimum age runs from 18 in Alberta to 21 in Quebec, and sales use plain packaging with advertising prohibited.
Uruguay chose registration, small quantities and no profit-driven retail, optimising for containment; Canada chose a licensed commercial market to displace an illicit one at scale.
5. Europe: passed and proposed
Germany
The Cannabis Act passed the Bundestag on 23 February 2024 by 407 votes to 226 with four abstentions, cleared the Bundesrat on 22 March 2024, and took force on 1 April 2024. Adults may hold 25 grams in public and 50 grams at home and grow three plants. From 1 July 2024 cultivation associations became lawful: up to 500 members, 50 grams per member monthly. Commercial sale, the second pillar, was excluded; pilots were discussed but, per the source, none enacted. In spring 2025 the government said it would re-evaluate the Act that autumn; the outcome could not be verified here.
Malta
Malta’s parliament passed its personal-use law on 14 December 2021 and it took force on 18 December 2021. Adults may carry 7 grams in public; up to 28 grams draws a 50 to 100 euro fine with no criminal record. A household may store 50 grams and grow 4 plants, and non-profit associations may supply 7 grams a day and 50 grams a month to at most 500 members. For-profit sale is barred and public smoking banned, overseen by the Authority on the Responsible Use of Cannabis.
Luxembourg
The law passed in June 2023 and took effect on 21 July 2023, permitting four plants per household and consumption at home. Public possession, use, transport and purchase remain prohibited, with reduced penalties up to three grams. A state retail chain announced in April 2023 remains proposed, not enacted, and a 2018 pledge of full legalisation was never implemented. Medical cannabis was approved in June 2018.
Czech Republic
This one needs the most caution. Possession under 15 grams or cultivation of fewer than five plants has been an infraction, not a crime, since 1 January 2010, and medical cannabis has been lawful since 1 April 2013 at up to 180 grams monthly. The source describes a further change from 1 January 2026 letting adults aged 21 and over grow three plants and hold 100 grams at home and 25 grams in public, with commercial sale still barred. That could not be verified against a governmental source.
6. The United States
The state and federal split
Cannabis remains Schedule I under the federal Controlled Substances Act of 1970. Oregon decriminalised in 1973, California authorised medical use by ballot initiative in 1996, and Colorado and Washington legalised adult use in 2012. Per the source, 24 states and the District of Columbia permit adult use and 38 states permit medical use. In 2005 the Supreme Court held in Gonzales v. Raich that federal authority survives state legalisation, so forbearance has been policy, not law: the Cole Memorandum of 29 August 2013, which shielded state-compliant operators, was rescinded on 4 January 2018, and an appropriations rider first passed on 30 May 2014 restricts federal spending against state medical programmes but needs annual renewal.
Hemp, and the change taking effect in November 2026
The farm bill signed on 20 December 2018 removed hemp — cannabis with not more than 0.3 per cent delta-9 tetrahydrocannabinol by dry weight — from federal control. Because it addressed one molecule by dry weight, an industry grew around intoxicating isomers it did not capture. A federal spending bill signed on 12 November 2025 closed that gap: per the law-firm analysis, the definition shifts to no more than 0.4 milligrams of total tetrahydrocannabinol per container and excludes cannabinoids synthesised outside the plant or marketed as having similar effects. It takes effect on 12 November 2026, one year after enactment, and the analysis expects most current cannabidiol products to exceed the limit.
7. Thailand in brief
Thailand legalised medical cannabis in 2018, the first Asian country to do so. In June 2022 cannabis flower left the narcotics list, releasing roughly 4,200 prisoners, while extracts above 0.2 per cent tetrahydrocannabinol stayed prescription-controlled. No controlling act accompanied the delisting, so ministerial regulation filled the gap.
On 26 June 2025 the Public Health Minister issued a notification reclassifying cannabis flower as a controlled herb, barring recreational sale and advertising and requiring prescription. A Thailand-focused legal-information site describes rules from January 2026 requiring medical supervision at dispensaries and banning online sales, with 7,297 of 18,433 shops closing, and says the Cannabis and Hemp Act was still unpassed as of July 2026. Reported penalties reach 25,000 baht and three months’ imprisonment for public consumption; sales to under-20s and export are barred.
8. Southeast Asia otherwise: Laos, Cambodia and Vietnam
What each country’s law says
In Laos, cannabis is illegal. The source records twelve months’ imprisonment for public use and a mandatory death penalty in certain drug cases, as recorded in 2009. It also notes open sale in some tourist-area businesses and bribes taken from those arrested; the latter does not soften the former.
In Cambodia, cannabis is prohibited: cultivation became illegal in 1961 via the convention and was criminalised again in 1992. Enforcement is called opportunistic and infused food is sold openly to tourists, but the source records a Siem Reap raid on 15 March 2013 in which 18 people were arrested, 14 of them foreigners.
In Vietnam, cannabis is illegal. The source gave no detail on penalties or enforcement, so no figures are stated; that absence is not evidence of leniency.
A plain safety note
Tolerated practice and written law are far apart across the region, and the gap can close without warning. Foreign nationals are not insulated and are often more exposed, to prosecution and extortion. Penalties in parts of Southeast Asia extend to very long sentences and, for some drug offences, capital punishment.
9. What the outcome evidence shows, and what it does not
Why no study is cited here
No empirical study is cited below, because no peer-reviewed outcome research could be retrieved while preparing this article; this section describes the debate qualitatively instead.
What can be reported are figures from the sources consulted, each a reference or analytical source rather than a study. For Uruguay, one states illicit supply fell from the main source of access in 2014 to 6.7 per cent of the market by 2024. For Canada, one reports 64 per cent of users in 2021 usually bought legally, and 5.4 billion dollars in tax revenue between October 2018 and August 2025. Neither is causal.
The four questions people argue about
On consumption, the dispute is whether legal availability raises use or mostly moves existing use into legal channels while improving measurement; estimates depend on willingness to answer honestly, which changes once a behaviour is not criminal. On young people, the stakes are highest and the methods weakest, since youth trends move for reasons unrelated to policy. On road safety, detecting tetrahydrocannabinol in a driver does not establish impairment at the time of driving the way a blood alcohol figure does. On illicit markets and revenue, displacement has been partial everywhere, and gross receipts ignore enforcement and health costs. All four are politically charged and quoted selectively by both sides.
Evidence status at a glance
| Claim often made | What can be said here | Status |
|---|---|---|
| Legalisation raises total consumption | Reporting shifts once criminality is removed | Not established |
| Legalisation raises youth use | Policy effect hard to separate from trend | Not established |
| Legalisation worsens road safety | Impairment measurement unresolved | Not established |
| Legal markets displace illicit supply | Partial displacement in reported figures | Reported, not causal |
| Legalisation yields significant revenue | Canadian receipts reported | Gross figure only |
| Regulatory gaps create substitutes | Substitutes follow definitional gaps | Supported by the European report |
10. What determines whether a scheme is judged a success
Three factors recur, none about whether legalisation is right in principle. Regulatory capacity comes first: Thailand’s 2022 delisting happened without a controlling act, and the framework has since been rebuilt by notification. Where the statute is thin, the regulator improvises and instability follows.
Pricing and tax design come second: a legal product much dearer than the illicit equivalent leaves the illicit supplier in business, while one taxed too lightly raises less than promised. Third is the persistence of the illicit market, the closest thing to a common yardstick, since displacement has been partial even in the oldest schemes. Definitional leakage is the related risk: the European drug agency’s 2025 report counts 24 semi-synthetic cannabinoids on European markets by the end of 2024, with hexahydrocannabinol in 27 countries and controlled in at least 22 member states, and links it to the 2018 legalisation of hemp in the United States.
11. What is plausibly next: announced, drafted, enacted
Sort every claim into three boxes. Announced means an intention that may never reach a chamber — Luxembourg announced full legalisation in 2018 and five years later enacted home cultivation only. Drafted means text exists and is moving, where Thailand’s Cannabis and Hemp Act reportedly sat and Germany’s commercial pillar remains. Enacted means in force, with a date, and is the only category worth planning around. The reverse is equally real: the hemp change and Thailand’s 2025 tightening are enacted restrictions.
Status summary
| Jurisdiction | Position as described by the source | Key dates |
|---|---|---|
| Treaty system | Schedule I; out of Schedule IV | 1961; vote 2 December 2020 |
| Uruguay | Legal; three routes; residents only | Signed 23 December 2013 |
| Canada | Legal; federal licensing, provincial retail | 17 October 2018 |
| Germany | Home growing, associations; no commercial sale | 1 April 2024; clubs 1 July 2024 |
| Malta | Personal use, home growing, associations | 18 December 2021 |
| Luxembourg | Home cultivation only; retail proposed | 21 July 2023 |
| Czech Republic | Decriminalised; wider change described from 2026 | 1 January 2010; 1 January 2026 |
| United States | Federal Schedule I with state regimes; hemp narrowed | Hemp change 12 November 2026 |
| Thailand | Delisted, then controlled-herb prescription | June 2022; 26 June 2025 |
| Laos | Illegal; capital punishment in some drug cases | Recorded 2009 |
| Cambodia | Illegal; enforcement called opportunistic | Criminalised 1992 |
| Vietnam | Illegal; no penalty detail verified | Not available |
12. Over to the community
The most useful thing you can add is what the law looks like where you live — not the headline, but what the statute says, how it is enforced, and where the two diverge. Tell us which of the five models your country fits, whether anything above is out of date, and what a visitor would most easily get wrong. Members in jurisdictions where this is a serious criminal matter should share only what is safe, with no identifying detail.
This article is part of the Asiannabis Community educational series on cannabis law and policy. It is general information, not legal advice, and cannabis law changes quickly — verify the current position in your own country before acting on anything here. Content is for educational purposes within jurisdictions where cannabis is legally permitted.