Seems like not much is done at the Thai end to intercept it. UK seizures at airports for 2024 were highest since records began, 50% coming from Thailand.
"The data suggest that about half of the arrests (184) involved arrivals from Thailand, 75 from Canada and 47 from the U.S."
https://www.benzinga.com/markets/cannabis/24/08/40604161/whats-behind-increased-cannabis-seizures-at-u-k-airports-supply-demand-and-naive-smugglers