Chiang Rai Weed & Cannabis 2026 — Shops, Nearest Clinics & PT 33 Rules

Chiang Rai province has cannabis shops, but our directory is still thin here. Right now it lists one entry: Rai Piang Hemp, a community enterprise and cannabis medicine research centre in Mae Chan district. We add more listings once their details have been checked, rather than publishing shop counts we cannot support.

How buying cannabis in Chiang Rai works now

Since 26 June 2025 cannabis flower has been a “controlled herb” under the Thai Traditional Medicine Act. A shop may sell it only to someone holding a PT 33 prescription from an authorised practitioner, such as a doctor or Thai traditional medicine practitioner certified by the Department of Thai Traditional and Alternative Medicine (DTAM). The prescription is valid for up to 30 days, a licensed outlet can sell up to a 30-day supply, and since January 2026 it must keep a DTAM-trained staff member on site whenever it is open.

We do not yet list a cannabis clinic in Chiang Rai. The nearest in our directory are Chiang Mai CM Mediclinic in Chiang Mai and Lampang Hospital Cannabis Clinic. The PT 33 prescription guide explains the process, and our Chiang Mai page covers the nearest large group of shops.

Rules for visitors in Chiang Rai

• The borders are close. Chiang Rai borders Myanmar and Laos. Do not carry cannabis across any border, including at Mae Sai and Chiang Khong.
• Public smoking that creates a smoke or smell nuisance can be fined up to 25,000 THB, with up to 3 months in prison, under the Public Health Act 1992. Temples such as Wat Rong Khun are public places.
• Selling without a prescription is a separate offence under a different law: up to 20,000 THB and up to a year in prison for the seller under the Traditional Medicine Act. See the penalties guide.
• CBD under 0.2% THC with Thai FDA registration needs no prescription. See the CBD guide.
• The Cannabis and Hemp Act has not passed, so ministerial regulations set the rules for now. Our tourist guide tracks changes.

Chiang Rai cannabis FAQ

Can I buy weed in Chiang Rai?

Only with a valid PT 33 prescription from an authorised practitioner. Without one, buying cannabis flower is not legal.

Is there a cannabis clinic in Chiang Rai?

Not in our directory yet. The nearest clinics we list are in Chiang Mai and Lampang.

Can I take cannabis to Laos or Myanmar from Chiang Rai?

No. Do not carry cannabis or cannabis products across any border.