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A study done on the Dhulbahante of 89 marriages, showed that of those who married within Dhulbahante, none of them married within their sub clan. Basically no inbreeding at all. Nomads know the risks of marrying cousins since they can see the effects it has on their herd.My parents are 15th cousins and even their sub clans were prohibited from marrying until 100 years ago. Rules like this sort of tell me it's not all that common. And that practices of cousin marriage vary depending on region and change over time.
(Ioan M. Lewis, Blood and Bone: The Call of Kinship in Somali Society).
I think that back home, cousin marriages have increased since the civil war though.