Wow I cannot believe how far America's cannabis disaster spread all over the world.

A quick look seems they could cultivate industrial hemp:

Cultivation of hemp is subject to a license available from the local prefecture. Not many of these licenses have been issued in recent years. There are two kinds of licenses. The one that is easier to obtain entitles the holder to cultivate only low-THC hemp for non-drug use. The most common seed strain is "Tochigishiro", an extra low-THC strain bred by the "Agricultural Experimental Station" in Tochigi prefecture, 50 km north of Tokyo.

I'm sure higher than normal radiation exposure will definitely contribute to worse cellular inflammation and 75% of all diseases. We don't want to see anyone in trouble, but it seems not offering our 99+% hemp CBD to all places in the world, including Japan, could be worse.