Guilea

Guilea was a valuable drug from Cerea. The native Cereans were very protective of their homeworld's ecology, and therefore only allowed immigrants and offworlders to visit city-size structures on the planet called Outsider Citadels. Like the spaceports on many planets, smuggling and other illegal activity often took place in the Outsider Citadels. As a result, customs officials often suspected visiting starships and crews of trafficking in guilea.

Text and facts from the “Guilea” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.