Why are so many Japanese suffering from a cedar pollinosis?

Although there is no accurate statistics, it is said that over 30 percent of the total population are suffering from a pollinosis in Japan and most of them are allergic to cedar pollen. Why are so many Japanese suffering from a cedar pollinosis? Actually, this is related to the former country’s strategy.
After World War II, the government encouraged planting the vast land with cedar trees to obtain cheap timber because cedar trees grow fast. But afterward they came not to be consumed by the influence of cheaper imported timber. Now those cedar trees are mature, but they aren’t logged, then they are emitting huge amount of pollen.
Now it is one of the big problems in Japan and there is no solution for the present.

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