What Is Illegal in Thailand: Rules Every Tourist Should Know

In short: The areas where tourists in Thailand most often get into trouble are vapes and e-cigarettes (banned outright), cannabis (medical use with a prescription only), unregistered drones, insulting the monarchy and smoking on beaches. Most penalties in this article come from published guides rather than official legal texts, so treat the figures as indicative, not exact.

Vapes and E-Cigarettes: Banned Outright

According to the UK Foreign Office, it is illegal to possess or use any vape, e-cigarette, pod, e-liquid or heat-not-burn device in Thailand. Its advice mentions heavy fines (typically 5,000–30,000 THB) and states there are no exceptions for tourists or personal use. Other published sources mention prison for importing (up to 10 years); amounts vary by source, so I don’t treat those as exact. Leave the vape at home.

Cannabis: Medical Use With a Prescription Only

According to commercial sources, tourists can buy cannabis only for medical use, with a PT33 prescription from a Thai practitioner. Foreign prescriptions and home-country medical cards don’t count. Smoking in public draws penalties, and taking cannabis out of Thailand is an offence. Regulations that took effect in April 2026 reportedly tightened licensing. A shop selling to you doesn’t mean the sale is lawful. Since most of these sources are commercial sites, check the official announcement as well.

Drones: Registration Required

According to the UK Foreign Office, flying an unregistered drone is illegal, with penalties of up to 100,000 THB, 5 years in prison, or both. For camera-equipped or heavier drones, registration, permit and insurance requirements are also described. If you plan to bring a drone, check the rules first.

Insulting the Monarchy

According to the UK Foreign Office, criticising the Thai monarchy is illegal, the law can be interpreted broadly and carries a long prison sentence. Published guides mention 3 to 15 years. It applies to locals and foreigners, in person and online. Think twice before posting on social media.

Illegal Drugs

According to the UK Foreign Office, even small amounts can bring heavy fines or imprisonment, and possessing Class A drugs can lead to the death penalty. For cannabis export, penalties start at 30,000 THB per kilogram.

Alcohol

According to the UK Foreign Office, alcohol sales are restricted between midnight and 11am, except in licensed hotels, international airport terminals and authorised entertainment venues. The legal drinking age is 20 (per published guides), and there are sales bans on some Buddhist holidays. Because rules change, ask about the current practice where you are.

Smoking in Public and on Beaches

Smoking in public places is banned; according to the UK Foreign Office the fine is up to 5,000 THB. Published guides add that smoking has been banned on more than 20 popular beaches since 2018. Check the signs before you settle on a beach.

Carry ID

Police may ask to see your passport. If you don’t have it with you, you could be asked to produce it within 24 hours at a police station. A copy of the passport photo page is usually sufficient.

Buddha Images and Tattoos

Removing Buddha statues or images without permission can lead to confiscation, fines or jail. Buddha tattoos aren’t always illegal but can cause real offence, and some travelers have been turned away at entry.

Cigarette Limit

More than 200 cigarettes per person is illegal; the excess may be confiscated and fined at 10 times its value.

Beyond the Law

Scams aimed at tourists are as big a problem as legal bans. I described the tuk-tuk, gem, jet-ski and nightclub traps in my tourist traps guide. For what to prepare before you go, see the pre-trip checklist.

How Reliable Is This Information?

• UK Foreign Office advice (I read the page directly): drones, vape penalties, alcohol sale hours, smoking in public, drugs, the monarchy, carrying ID, the cigarette limit.
• Published guides and commercial sites: the prescription rule for cannabis, the scope of the beach ban, the drinking age, import penalties and the 3–15 years figure for insulting the monarchy. Don’t read these as official announcements.

I haven’t read the Thai legal texts themselves. Rules can change; this page was last updated on 4 November 2026.