Then the Somali government should ban it. But, they haven't so why should Kenya care if it's harmful or not? It isn't Kenya's job to babysit Somalia. Kenyan farmers make a livelihood on cultivating and selling Khat and they have a massive clientele. Kenya isn't addicted to Heroin but I know you would like to see that. There are a few thousand people who abuse heroin in Mombasa but the Kenyan government is making strides to combat drug use in the country. Soon, there will be no such thing as a country called Somalia.