If the infrastructure for transporting that food exists, then yes. The problem with relying on food from other countries is that it undermined your (food) security. It's possible that this can be used as a tool in in relations against your country or in the time of a crisis you're more likely to be left hanging. Eg look at all those companies/countries that depend on some important goods from China. During the current crisis the resources in China will be used in China first. Now imagine that same situation, but with food. I think that's why western countries subsidize agriculture so heavily.
Yeay democracy, I guess.
If I have village where no food can be imported and limited amount of agricultural land. If I grow khat how am I going to feed my family if outside food can not come in ? Will the villagers be willing to pay more khat even when food is scarce ? I think I am missing something.
At worst it might be raising food prices for non farmers, but farmers are going to be strictly better off.
Similarly, would wealthy khat growers be willing to pay more for food? Since they have more wealth? If so then it would create inflationary pressure on food prices and thus make growing food pay more than it had before.
I can easily imagine that the markets would be imbalanced at first, but it seems the mechanisms would correct that if it is simply more valuable to grow khat.