New evidence gathered among Somali refugees living in Eastleigh, Nairobi, shows miraa or khat can lead to serious mental health problems, especially when chewed in large amounts.A report published on Wednesday by the universities of Nairobi, Konstanz of Germany and Minnesota, US, and the Africa Mental Health Foundation provides new evidence that could boost recent calls by Muslim leaders to ban the trade of the product at the Coast.The researchers in a new study published in the journal Frontiers in Public Health, and which specifically targeted...