What travelers need to know about drug laws, the legal drinking age, visa restrictions and the Thai royal family.
Photo © iStock/tobiasjo
Thailand has long attracted hedonistic travelers, but don’t make the mistake of thinking “anything goes” in the Land of Smiles. Behave with the same caution and respect you show back home and you’ll avoid trouble.
- Respect the Thai King
- Always carry your passport in Thailand
- Avoid illegal drugs in Thailand
- Thailand's legal drinking age is 20
- Don't overstay your visa in Thailand
Respect the Thai royal family
In many Western countries, it’s normal for people to make fun of, or criticize national figureheads, even royalty. Thailand, however, has extremely strict laws called lese-majeste, under which people can receive long prison sentences for insulting its monarchy.
Like the UK, Japan, Spain, Belgium and the Netherlands, to name a few, Thailand is a constitutional monarchy. This means it has a Government, but its head of State is a royal figure. In Thailand’s case, that is King Maha Vajiralongkorn.
Lese-majeste complaints can be filed by anyone, against anyone, and are always investigated by the police.
While it is rare for tourists to face lese-majeste charges, it can happen. So do not, in any circumstances, say anything negative about Thailand’s monarchy while you’re in the country. Also, do not write anything derogatory about the Thai Royal family online. It’s better to avoid mentioning them altogether.
There will also probably be times during your trip to Thailand that you’ll need to stand to attention as a mark of respect to the nation and, by extension, to its royal family. In urban areas, at 8am and 6pm every day, you’ll hear loudspeakers playing the Thai national anthem. Follow the lead of locals, stop whatever you’re doing, and stand still and silent until the song finishes.
Another version of this occurs before movies at Thai cinemas. Just before the film begins a video is shown celebrating the Thai Royal family, during which the audience will stand quietly. Do as they do to avoid causing offense and potentially landing yourself in trouble.
Avoid illegal drugs in Thailand
It can be a life-altering mistake to ignore Thailand’s stringent drug laws. You could face long imprisonment if found in possession of cocaine, heroin, ecstasy, LSD, opium, amphetamines, benzodiazepines, ketamine or magic mushrooms (among others).
And don’t be fooled by worldwide headlines about Thailand legalizing cannabis in early 2022 – smoking marijuana can still land you in a Thai jail. As of 2026, only medical marijuana is legal and you cannot smoke it in public. Many marijuana shops closed down and strict regulations are back in enforcement.
If a foreigner gets caught smoking illegal marijuana, deportation or time behind bars is a real possibility.
Thailand's legal drinking age is 20
In Europe, the legal drinking age ranges from as young as 16 up to 18 years old, while in Australia, New Zealand and parts of Canada it is 18. In Thailand, you have to be 20 years old to legally buy alcohol. This may surprise some readers, as many teenage tourists drink alcohol while partying in Thailand.
No matter what other tourists tell you about the leniency regarding underage tourists and alcohol, Thai law is Thai law. And Thai police have publicly stated they’re cracking down on underage drinking more than ever since the pandemic. If you look young, you may want to carry your ID on you when in bars, just in case.
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Don't overstay your visa in Thailand
Especially for backpackers slowly traveling around Asia, the desire to remain in Thailand for several months can be strong. And the same way you may hear it’s easy to get away with smoking weed, underage drinking, or not carrying any evidence of your passport, fellow travelers may convince you that overstaying your Thai visa isn’t a big deal. “You’ll just get a small fine,” they may say.
To an extent, they’re right. If you remain in Thailand beyond the date permitted on your visa you’ll be fined 500 baht (USD $15) for each day you have overstayed up to a maximum of 20,000 baht ($600). I have met travelers who preferred to pay that maximum fine rather than face the hassle of renewing their visa.
That is a big mistake for two reasons. Firstly, if you are caught by the police while wandering around Thailand overstaying your visa (as opposed to at the airport as you depart), you can potentially face more serious penalties, including a ban from re-entering Thailand for a period of time. Thai police have been known to conduct sweeps of areas where budget travelers stay, looking for offenders, so it's more likely than you might think.
Secondly, if you overstay your Thai visa by between 90 days and one year, you face a one-year ban from re-entering Thailand and will find it more difficult to get Thai visas in the future. The penalties also increase for overstays of more than one year.
Always carry your passport in Thailand
Thai authorities recommend tourists and foreign ex-pats carry their passports with them at all times while in Thailand. If you are comfortable doing that, then go ahead. Many tourists, however, are justifiably worried that constantly having their single most important document on their person greatly heightens the risk of it being lost or stolen.
I won’t advise against something that is law. Just make sure, at a minimum, you carry a clear, printed photocopy of your passport photo page, your Thai VISA page, and of your Thai entry stamp. Also, keep photos of these pages in your phone. It is very rare for tourists to be asked by Thai police to show their passports. But if this does occur, then at least producing a photocopy and phone photo of your passport will help greatly.
Beyond just staying on the right side of the law, there are a number of other things you can do to keep safe in Thailand. You can read more about them here.
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