Thailand’s Laws, Made Simple
Thailand is a relaxed place to visit, but a handful of local laws catch first-timers out. None are hard to follow, and knowing them in advance keeps a great trip trouble-free.
Four Things to Remember
Most visitors never brush up against the law. If you remember only a few things, make it these: never touch drugs, leave vapes at home, always be able to show ID, and treat the monarchy with respect. The rest is detail.
The Laws that Catch First-Timers Out
A few local laws surprise visitors. None are hard to follow, but the penalties can be severe, so it pays to know them before you go.
Taken very seriously
Penalties are severe, up to life imprisonment or death for trafficking.[4] Police run random tests, so simply do not risk it.
Medical use only
Since June 26, 2025, cannabis is medical use only. You need a PT 33 prescription from a Thai-licensed practitioner; a prescription from home does not count. Possession without one can bring a fine of up to 25,000 baht and up to three months in jail.[1] Never carry it across a border in either direction.
Actually illegal
It is illegal to import or sell vapes and e-cigarettes, and being caught with one can mean confiscation and a heavy fine.[2] Leave them at home.
On-the-spot fines
Smoking is banned on many beaches and in public spaces, and dropping butts or litter carries fines.
Hours & dry days
Shops sell from 11am to midnight, you must be 20 to buy, and sales stop entirely on five Buddhist holidays and election days. The old 2pm to 5pm afternoon gap was scrapped for good in May 2026.[3]
Lèse-majesté
Insulting the royal family is a serious crime. Treat images, currency, and the anthem with respect.
What You Can and Cannot Bring
Leave them behind
Expect vapes and e-cigarettes to be confiscated if found, with a possible fine on top. Do not pack them, even in checked bags.
Duty-free limits
You can bring 1 liter (about a quart) of spirits and 200 cigarettes duty-free. Foreign currency worth about US$20,000 or more must be declared on arrival.[5]
Bring the prescription
Carry a copy of your prescription. Some common painkillers and cold or ADHD medicines are controlled here, so check before you fly.
Everyday Rules Worth Knowing
Carry your ID
Police can ask to see your passport. Carry it, or a clear photo plus a copy, and keep the original safe at your hotel.
Ask first
Ask before photographing people and monks, and inside temples. Avoid military sites and restricted airport areas.
Mostly illegal
Almost all gambling is illegal, aside from the state lottery and licensed horse racing. Skip the casual card games.
License & helmet
You need an International Driving Permit alongside your home license. Helmets are the law on scooters, and police do check.
If Something Goes Wrong
These rules change often. We check this page against official Thai government sources, including the June 26, 2025, shift of cannabis to medical use only and the Royal Gazette notice of May 28, 2026, that permanently ended the 2pm to 5pm alcohol ban and set sales hours at 11am to midnight. Always confirm the current rules with an official source close to your travel dates.
More First-Timer Guides
Written by Belle, a Thai American who travels to Thailand every other year and has family in Bangkok. Fees, journey times and rankings were rechecked on August 1, 2026, against the numbered sources below. Brand mentions are never paid placements, and the guide is reader-supported: some links may earn a commission, at no extra cost to you.
How we research →- 1Cannabis relisted as a controlled herb, Department of Thai Traditional and Alternative Medicine, Ministry of Public Health, notification effective June 26, 2025. Supports: medical use only, the PT 33 prescription requirement, and the 25,000 baht fine with up to three months in jail.
- 2Prohibited and restricted goods, Thai Customs Department. Supports: that importing or selling vapes and e-cigarettes is illegal, and the duty-free allowance of 1 liter of spirits and 200 cigarettes.
- 3Alcohol sales hours notice, Royal Gazette, May 28, 2026. Supports: sales from 11am to midnight and the permanent end of the 2pm to 5pm afternoon ban.
- 4Narcotics Code penalties, Office of the Narcotics Control Board. Supports: penalties up to life imprisonment or death for trafficking.
- 5Currency declaration requirements, Thai Customs Department. Supports: that foreign currency worth about US$20,000 or more must be declared on arrival.
- 6Tourist Police 1155, Royal Thai Police. Supports: the round-the-clock English-speaking Tourist Police line.