One thing I know for sure is, the bigger your lips are the worse affected you are by EC.
In terms of genetics, I’m not quite so sure. My cousin did develop it, even now she still has the EC symptoms - although not as bad as I have it. I have given her my best advice in trying to deal with it the best way possible.
I honestly believe anyone can get EC. If your lips are damaged due to excessive lip-licking/biting then eventually EC is around the corner.