Ish
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And brought haemophilia into the family though I don´t exactly know whether this illness is a result of inbreeding. I believe that marrying your first cousin nowadays is considered strange and "annatural" even it might be allowed in some countries. Therefore I don´t think Harry will ever marry one of his first cousins.
The hemophilia had nothing to do with Victoria marrying her first cousin. Victoria was a carrier for it (likely through a random mutation as it wasn't seen in her family previously), which is how it was passed into her descendants - every one of her children had a 50% chance of receiving the gene, and if they received it her sons would have been hemophiliac (it's a X chromosome trait) and her daughters would have been carriers (they couldn't have had it as their father didn't have it). Any daughters of a son with hemophilia were guaranteed to get the gene as well (making them at best carriers; if their mothers were also carriers then they had a 50% chance of getting the disease), and all the children of any daughters who were carriers had a 50% chance of receiving the gene as well.
It spread so thoroughly throughout European royalty not so much because of incest, but simply because Victoria had 9 children who married other European royals. The only time incest would have been at issue with the spread of the disease is when/if any women had it (I can't remember if any such case happened), as her father would have had to have it, and her mother would have had to have been a carrier as well.