Chewing this stuff is very common among Somalis. Also Kenyans, Yemenis and Ethiopians.

I read somewhere that over 2500 tonnes of the stuff was imported here last year worth around £14 mill almost exclusively from Kenya.
You can bet that the Kenyan farmers will find ways to maintain their incomes. Since this stuff gets taxed by our government
you can bet the Exchequer will also be miffed at the loss of income.