Cannabis Law in Thailand: History, Rules, and How It Works

Quick answer

Thailand removed cannabis from its narcotics list on June 9, 2022, after legalizing medical use in 2018. The plant had been banned since the early 1970s, before which it was a traditional Thai medicine. Today, licensed dispensaries serve adults 20 and over who show a passport or official ID. Pregnant and breastfeeding people are not served, public consumption can draw a nuisance fine, and carrying more than 30g without industry documentation classes you as a dealer.

Key facts

• Cannabis was a traditional Thai medicine well into the twentieth century, then prohibited by the early 1970s as the US war on drugs spread.
• Thailand legalized medical cannabis in 2018 and removed the plant itself from the narcotics list on June 9, 2022. The market now has over 7,000 dispensaries and hundreds of farms.
• You must be 20 or older to buy from a licensed dispensary. ID is required by law on every purchase. Pregnant or breastfeeding people are refused service.
• Carrying more than 30g of cannabis product without industry documentation classes you as a dealer under official Thai regulation.
• Cannabis extracts are capped at 0.2% THC. Anything stronger is treated as a narcotic.

Siam Green has 5 branches in Thailand: Phrom Phong, Silom, Nana, Chinatown, and Koh Samui (Chaweng).

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Introduction

For most of living memory, cannabis was illegal almost everywhere, and Thailand was no exception. What tends to get lost in that history is how recent the ban actually was. The plant grew in Thai kitchens and medicine cabinets for centuries before a few decades of prohibition pushed it underground. This page lays out how the law changed, what removing cannabis from the narcotics list in 2022 actually allows, and the rules a licensed dispensary follows now.

Fifty years of prohibition

Cannabis was used as a traditional medicine in Thailand well into the twentieth century. America’s war on drugs was the main reason the plant became strictly prohibited by the early 1970s. Through those decades, a cannabis case meant jail sentences, heavy fines, and the organized crime that prohibition tends to create.

After years of debate, Thailand legalized medical cannabis in 2018. The shift came from a growing recognition that the plant had long been part of the Thai Traditional Medicine pharmacopeia. Researchers revisited those traditional uses, and refined versions of them are practiced today.

On June 9, 2022, Thailand removed the cannabis plant itself from the narcotics list. People could grow and consume within private guidelines without punishment, and a retail license was affordable. The market expanded quickly. There are now over 7,000 dispensaries and hundreds of farms across the country.

The law is still settling. Because the science trailed the culture for decades, and much of that culture existed underground, there is limited long-term data on how wide access affects a population. That gap is why policymakers have floated rolling back recreational use more than once since June 2022, and also why they have said they are waiting on more public input before refining the regulations. For now the framework holds, and the rules below are what apply.

The rules in Thailand today

The core rules are short, and most dispensaries enforce them at the counter.

• Age. No one under 20 is served.
• ID. A passport or official ID is required by law on every purchase.
• Pregnancy. Pregnant or breastfeeding people are not served.
• Public consumption. Consuming in public is treated as a nuisance and can result in a fine. If neighbors are bothered by the smell, they can report it and you can be asked to stop. Many people consume in a dispensary’s private lounge or on a tolerant balcony, so it is worth checking your accommodation’s policy first.
• The 30g threshold. Under official Thai regulation (English summary), anyone carrying more than 30g of cannabis product is treated as a “dealer” and is expected to hold appropriate documentation, such as a work permit in the cannabis industry.
• The 0.2% THC cap. Extracts are limited to 0.2% THC. Anything stronger is classed as a narcotic. This rule catches people out, because it draws a hard legal line between flower and concentrated products.

These limits exist largely as protective measures while the long-term data catches up. They are also the parts of Thai law that visitors most often get wrong, so they are worth committing to memory before you arrive.

How a licensed dispensary operates

A licensed shop is the simplest way to stay on the right side of these rules, because the compliance happens at the counter. Siam Green opened its first branch at Phrom Phong in January 2023 and now runs five locations across Bangkok and Koh Samui. Each one checks ID, refuses service where the law requires it, and keeps the legal limits in view.

Two things separate a compliant dispensary from an informal seller. The first is staff who actually know the rules. Siam Green’s budtenders sit weekly classes on the science, the law, and current industry practice, so the person at the counter can explain what the regulations require rather than guess at them.

The second is storage. Cannabis kept badly in a tropical climate degrades fast, growing mold and breaking down in the heat and humidity. Controlled temperature and humidity units matter for that reason, and it is reasonable to ask whether a dispensary uses them. Siam Green stores run custom units and check stock regularly for mold and impurities. Visible mold shows up as a dull grey-white fuzz, denser than the plant’s trichomes, and staff are trained to pull anything that shows it.

One more legal point sits behind all of this: importing cannabis into Thailand remains illegal. Licensed shops source their flower from local farms instead, of which there are now hundreds, run by Thai growers and foreign investors alike.

Etiquette inside a dispensary

Walking into a dispensary works like any other licensed venue. Budtenders often double as space-holders for people consuming on site, so it is normal for a customer to have half-closed eyes or a slightly abstract train of thought, and nothing to read into.

Many dispensaries, Siam Green included, also serve alcohol, and some have full cocktail bars. Combining the two is less predictable than either on its own, which is worth keeping in mind. Staff are there to keep the atmosphere calm. If someone overdoes it they are looked after, given water or a quiet corner until they are fine.

A couple of unwritten rules hold across most shops. Don’t bring flower bought elsewhere to consume on the premises, and don’t arrive already heavily intoxicated. It is the same courtesy any hospitality venue expects.

Where the law goes next

Thailand’s cannabis framework is young and still moving. Legislators have not settled on a final shape, and the recreational-versus-medical question keeps resurfacing. What has not happened, despite decades of warnings, is the social collapse that prohibition-era propaganda predicted.

For anyone trying to follow the rules, the practical takeaways are the ones above. Be 20 or older, carry ID, stay under 30g, and remember that extracts above 0.2% THC are still treated as narcotics. The rest comes down to using licensed shops where that compliance is handled for you.

If you have questions about how any of this works in practice, our staff at the five Siam Green branches in Phrom Phong, Silom, Nana, Chinatown, and Koh Samui (Chaweng) can walk you through it in person.