The Dutch conservative coalition government has signaled since January that it intended to prohibit khat, the mild stimulant plant from the Horn of Africa, and now, indications are that the ban will happen soon. But the move is drawing heat from critics who charge it is based more on political considerations than hard science.

http://cannabis.hawaiinewsdaily.com/2012/04/10/looming-dutch-khat-ban-draws-criticism-complaints/