The rate of first cousin marriage was 21%. Interestingly, while 53%
of respondents were in favor of consanguineous marriage, 62%
agreed it could cause genetic disease and 47.8% agreed it could cause social problems.
From my research about this topic; it seems that marriage to a first cousin is not the problem. The problems surface when your parents, grand parents and great grandparents all have married their first cousin. This causes for hereditary issues to increase because of the small pool of genes, which would be similar or the same.