Checked 14 October 2026 · Independent guide by East&Well.
Short answer
Taking other medicines too? Check them all for your trip
The rule
Since 12 Dec 2024, a product is classed as a narcotic under Japanese law if its THC is over 10 ppm (oils and powders), 0.1 ppm (drinks and lotions) or 1 ppm (everything else). Japan’s health ministry won’t advise on individual products.
What to do
Leave it at home unless the maker certifies its THC is below Japan’s limits.
The rule
Korea says not to bring CBD, marijuana or hemp products, even on an airport layover, without written approval from the Korean government.
What to do
Leave it at home.
The rule
Marijuana is prohibited in China, and we haven’t found an official rule on CBD for travellers. Hong Kong has treated CBD as a dangerous drug since 1 Feb 2023.
What to do
Leave it at home.
Sources
Chongqing government: carrying medicines into China (29 Jun 2026); Hong Kong government: CBD is a dangerous drug
Checked 14 October 2026
The same medicine, as it’s written in each country. Not yet checked by a pharmacist.
Since 12 Dec 2024, a product is classed as a narcotic under Japanese law if its THC is over 10 ppm (oils and powders), 0.1 ppm (drinks and lotions) or 1 ppm (everything else). Japan’s health ministry won’t advise on individual products. Leave it at home unless the maker certifies its THC is below Japan’s limits.
Korea says not to bring CBD, marijuana or hemp products, even on an airport layover, without written approval from the Korean government. Leave it at home.
Marijuana is prohibited in China, and we haven’t found an official rule on CBD for travellers. Hong Kong has treated CBD as a dangerous drug since 1 Feb 2023. Leave it at home.
What this page is
A plain summary of each government’s own rules, with links, checked 14 October 2026.
What it isn’t
Legal or medical advice. Rules change, and the officer at the border has the final say.