Cannabis in Thailand: the 2026 Rules for Koh Phangan Visitors

The short answer, if you only read one paragraph

Cannabis in Thailand is now medical-only. Since 25 June 2025 the flower has been classed as a "controlled herb" rather than a free-for-all herbal product, and buying it legally requires a prescription issued in Thailand by a licensed practitioner on the form known as PT 33. Smoking in public was never legal and still is not. Taking any of it out of the country is a serious matter, and getting more serious. Most of what you will read online about Koh Phangan's weed shops was written in 2023 or 2024 and is now wrong.

That matters here more than in most places, because the island filled up with dispensaries during the open years and a lot of the signage is still on the walls.

What changed, and what did not

Thailand delisted cannabis from its narcotics schedule in June 2022 and spent three years as the most permissive market in Asia. The reversal, when it came, did not put the plant back on the narcotics list. Instead the Ministry of Public Health reclassified cannabis flower as a controlled herb under the traditional medicine law, which means it can only be sold by licensed shops, only to people aged 20 and over, and only against a prescription valid for a maximum of 30 days.

Several things follow from the way it was done:

• Only the flower is the controlled item. Leaves, stems, roots and seeds sit under a different statute, which is why cannabis-leaf tea and leaf-cooked dishes did not disappear overnight.
• Extracts containing more than 0.2% THC by weight remain classified as narcotics. That threshold is lower than the hemp limit in many countries, so a legal-at-home oil or gummy may not be legal here. Do not pack it.
• Online sales, delivery and vending machines are banned. Every purchase is in person.
• Advertising is heavily restricted, which is why compliant shops now look duller than they did.

Enforcement has been structural rather than dramatic: licensing conditions tightened from January 2026 to require a trained practitioner on site during opening hours, plus proper storage and odour control. Shops that were retail-only had to close or attach themselves to a clinic or pharmacy. Nationally, something like 40% of the roughly 18,400 registered shops had gone by early 2026, with thousands more licences falling due through 2026 and 2027. On the islands you can see this in person: shuttered fronts, faded leaf logos, and a smaller number of places that now have a consultation desk near the door.

If you have a genuine medical reason

The process at a compliant shop or clinic is a consultation with an authorised practitioner, who assesses you and decides whether cannabis is appropriate. A passport and being 20 or over are necessary but not sufficient — the assessment is supposed to be real, and a prescription is not guaranteed. Consultation fees quoted by Thai clinics and dispensaries online vary widely, from a couple of hundred baht at budget tourist-area shops to a few thousand at specialist clinics; we have not price-checked shops on Phangan and would not trust a figure we had not seen ourselves.

A prescription from your own country does not count. Nor does a medical card. It has to be issued in Thailand.

Where you can and cannot use it

Smoking in public is dealt with through the nuisance provisions of the Public Health Act, and the figure everyone quotes is up to three months' imprisonment and a fine of up to 25,000 baht. Lawyers argue about exactly which section bites and when, which is a poor reason to find out. In practice "public" means the beach, the road, a bar, a restaurant, a viewpoint, the ferry pier — everywhere you are likely to be.

Private property is different, and that is where the honest caveat sits: it is the owner's call, not yours. Hotels, guesthouses and villas can and do prohibit it, and the smell carries a long way on a still evening in the interior of the island. If it matters to you, ask before you book rather than after you arrive. Most places on Phangan that describe themselves as wellness properties will say no indoors at the very least.

Two more local notes. Driving impaired is an offence whatever you have taken, and Phangan's hills, sand patches and evening rain make it an especially bad idea. And none of the above applies to the mushroom shakes still quietly offered near the party beaches — psilocybin is a narcotic in Thailand and always has been.

Do not take any of it home

This is the part that ruins holidays. Exporting cannabis from Thailand without a permit is illegal, and there is now a fines regime under which couriers pay Thai Customs 30,000 baht per kilo — the UK's National Crime Agency puts the average bill for a caught courier at around £17,700, or up to two years in prison. The scale of the trade explains the attention: 142 cannabis smugglers were caught arriving in the UK by air in 2023, 801 in 2024, 976 in 2025, and 600 in the first six months of 2026 alone.

Nobody carrying a few grams home in a wash bag is the target of that operation. They are, however, standing in the same X-ray queue at Samui or Suvarnabhumi.

What happens next

The rules are still moving. A draft Cannabis and Hemp Act went to public consultation in spring 2026 and stalled. On 22 September 2026 the cabinet approved a separate draft cannabis control bill, which tightens oversight of cultivation and processing, requires growing plots to be registered by size, and raises penalties. It now goes to the House of Representatives, so nothing has changed on the ground yet — but if you are reading this months after publication, assume the framework has tightened rather than loosened, and check before you rely on any of it.

Coming to the quiet side of the island

Most guests who ask us about this are not asking about parties. They are asking whether an evening on a terrace is going to cause a problem, or whether a CBD oil in their luggage is a risk. The short version: the oil is the bigger risk, the terrace depends on whose terrace it is, and the airport is where carelessness gets expensive.

If you want the full picture of how the island's rules and rhythms actually work, the rest of our journal covers the practical ground — alcohol dry days, medical care, driving, and where Ullassa sits in the quiet interior above Maduawan.