Back when Bubba had us in Somalia it was pointed out that Khat doesn't grow in the country, but rather was flown in daily, mainly from Kenya. It is only good a few days after being harvested. I've often wondered that if we wanted tackle Somalia we shouldn't start by a surprise interdiction of the Khat supplies. Declare the whole country a no fly zone, loiter some A10s over the main overland routes and blockade the coast. Their borders are long so we'd never get all the stuff, but we should be able to engineer a significant short term shortage. The sheer volume of the stuff consumed daily ensures that an improvised under fire replacement supply system will be less effective. The price would skyrocket and a lot of low level AK47 toting flunkies aren't going to be able to afford or even find their daily fix. Attacking gunmen undergoing acute drug withdrawal symptoms should be easier than those that are high on the stuff.
Although I think Khat makes attacking them much easier. When they are high off the stuff they tend to shoot quite wildly (i.e hitting everything but the target). Which is a good thing for our guys.