Last month I went to South Korea, and in Narita airport I bumped into this sign that says “Forbidden to bring ham or sausages from Europe”. Yes, it is forbidden; however this fact is unknown to most people.
Many foreigners that live in Japan, even knowing this fact, they still try to sneak in some sausages or ham vacuum packed. Being a Spaniard, I do it sometimes to bring the highly appreciated jamón serrano to Japan. However, I know that in the worst of the scenarios, my jamón could be even burnt at the airport. This happened to Zuco, who had his chorizo burnt at the customs.