Is weed legal in Koh Phangan, Thailand in 2026?

Only for medical use. Since 26 June 2025 cannabis flower has been a 'controlled herb' in Thailand, and buying it requires a PT33 prescription from a licensed Thai practitioner for an approved condition. Recreational buying and use are not legal on Koh Phangan, even though some shops still operate. Violations of the controlled-herb rules carry up to 1 year in prison and a 20,000 THB fine.

Can tourists smoke weed at the Full Moon Party in Koh Phangan?

No. Haad Rin beach is a public place, and smoking cannabis in public is prohibited for everyone, with or without a prescription, with fines of up to 25,000 THB. The Full Moon Party is one of the most heavily policed events in Thailand: police run checkpoints, use sniffer dogs at ferry piers and can require urine tests from people they suspect of drug use. In January 2026 police arrested dealers at a Full Moon Party as part of a national anti-drug campaign.

Are the ฿300 medical certificates sold at Koh Phangan cannabis shops legal?

No. On 14 August 2026 Interior Ministry officials raided unlicensed cannabis shops on Koh Phangan that sold pre-signed medical certificates for 300 baht so tourists could buy and smoke cannabis on site. Officials said the scheme violated the law. The operation, with branches on Koh Phangan, Koh Samui, Phuket and Bangkok, earned about ฿16 million a year. A certificate bought over the counter does not give a buyer legal cover.

What happens if you get caught with weed or mushrooms in Koh Phangan?

Small amounts of cannabis without a prescription are usually confiscated and may lead to a fine, but you can be charged. Magic mushrooms, including the 'mushroom shakes' sold at parties, are a Category 5 narcotic, and consumption or possession carries up to 1 year in prison or a 20,000 baht fine. MDMA, ketamine, cocaine and meth carry much heavier charges. A drug conviction can lead to deportation and a ban on re-entering Thailand.

Can I take cannabis from Koh Phangan to Koh Samui airport?

Do not. Taking cannabis out of Thailand counts as drug trafficking. Samui International Airport, the main air route off the island, was the site of one of Thailand's largest cannabis-smuggling busts in March 2025, when more than a dozen foreigners were arrested with hundreds of kilograms in their suitcases. Ferry piers at Thong Sala and on the mainland at Surat Thani are also checkpoint locations.

Is Weed Legal in Koh Phangan, Thailand? Laws & Risks (2026)

⚖️ Legal Status at a Glance — Koh Phangan, Thailand

Recreational Use Not Permitted

Medical Purchase Rx Required (PT33)

Full Moon Party / Piers Checkpoints & Raids

Export / Airport Trafficking

Regulation Status Shifting

Overview

Koh Phangan is a small island in the Gulf of Thailand known for the monthly Full Moon Party at Haad Rin, which draws tens of thousands of mostly foreign visitors. The island's reputation for relaxed drug use is outdated. Cannabis has been medical-only since 26 June 2025, and in 2026 Koh Phangan has become a focus of national crackdowns.

The most important point for visitors: a cannabis shop being open does not make a purchase legal, and a "medical certificate" sold at the counter for a few hundred baht does not protect you. Ministers shut down exactly that scheme in August 2026.

The Law Right Now

A Ministry of Public Health notification under the Protection and Promotion of Thai Traditional Medicine Knowledge Act B.E. 2542 reclassified cannabis flower as a "controlled herb" from 26 June 2025. Legal purchase requires a PT33 prescription from a licensed practitioner. Since September 2025 prescriptions are limited to five approved conditions, and each one is valid for no more than 30 days. Violations of the controlled-herb rules carry up to 1 year in prison and a 20,000 THB fine. Since 1 May 2026, sales are restricted to hospitals, pharmacies, licensed herbal retailers and traditional healers.

Public smoking is banned on every beach, road and pier, prescription or not. Fines go up to 25,000 THB. Edibles, vapes and oils are a separate risk. Cannabis extracts with more than 0.2% THC are still Category 5 narcotics under the Narcotics Code.

Magic mushrooms, including party "mushroom shakes", are a Category 5 narcotic. Consuming or possessing them carries up to 1 year in prison or a 20,000 THB fine, and possession with intent to sell carries up to 15 years.

Around Full Moon nights police have long run pier checkpoints with sniffer dogs and can require urine tests from suspected users, including on the route back to Surat Thani.

Realistic Consequences

A tourist with a gram or two of flower in a bungalow is not the main target, and small amounts are often dealt with by confiscation and a fine. Enforcement becomes strict in three situations. The first is Full Moon nights: on 30 January 2026, provincial narcotics police arrested dealers at Haad Rin as part of a national campaign ordered from Bangkok. The second is private parties with harder drugs: in January 2026, three Israeli tourists were arrested at a villa party with cocaine, ketamine and MDMA. In March 2026, an Israeli suspect was arrested with 389g of cocaine, and two Australians were charged alongside him. The third is leaving the island with cannabis.

For foreigners, the bigger consequence is often immigration, not the fine. Under the Immigration Act B.E. 2522, drug convictions commonly lead to deportation and a ban on re-entering Thailand. A new Prime Minister's Office deportation regulation took effect in August 2026, and the Immigration Bureau has ordered wider probes into foreign suspects on Koh Phangan.

📡 Regulation Pulse

26 June 2025: cannabis flower reclassified as a controlled herb; a PT33 prescription is required from September 2025.
22 January 2026: about 170 officers raided 25 sites on Koh Phangan; one suspect was charged with selling cannabis without permission.
26 April / 1 May 2026: new ministerial regulations tighten control of THC extracts and restrict where cannabis can be sold.
14 August 2026: Deputy Interior Ministers raided unlicensed Koh Phangan cannabis shops selling ฿300 pre-signed medical certificates — a chain with branches on Koh Samui, Phuket and Bangkok earning about ฿16 million a year.
Late August 2026: a new national deportation regulation for foreign offenders took effect.

Public Sentiment

Koh Phangan's economy relies on party tourism, and many cannabis shops still trade as before 2025. The pressure comes from Bangkok: in 2026 ministers and senior police repeatedly visited in person, treating drugs, nominee businesses and unlicensed foreign operators as one problem.

Practical Advice for Visitors

Do not buy a "medical certificate" at a shop counter. Pre-signed ฿300 certificates were the reason for the August 2026 raid.

Never smoke on Haad Rin or any other beach. Public smoking is banned for everyone, with fines up to 25,000 THB, and Full Moon nights have the heaviest police presence of the month.

Refuse mushroom shakes and anything offered on the beach. Mushrooms are a Category 5 narcotic.

Expect checks at the ferry piers, including Thong Sala, the island's main pier, and on the mainland at Surat Thani. Carry nothing on the ferry. If you are clearly intoxicated, you can be asked for a urine test.

Do not take cannabis through Samui International Airport. In March 2025, more than a dozen foreigners were arrested there with hundreds of kilograms of cannabis. Exporting cannabis counts as trafficking.

Treat any drug charge as an immigration problem as well. Deportation and a re-entry ban can follow a conviction. Contact your embassy before signing anything written in Thai.

Related guides: Phuket · Bangkok · Chiang Mai · Bali

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Cannabis in Koh Phangan, Thailand
Full Moon Raids, Fake Prescriptions & What Visitors Must Know