To me it is obvious that self-control depends significantly on your genes. I have ADD, but lived a long time without medication. I could barely do get anything

To me it is obvious that self-control depends significantly on your genes. I have ADD, but lived a long time without medication. I could barely do get anything done at all before I got medication, and then when I'm on medication I become one of the most dedicated workers you've ever seen. If something as simple as dopamine can have such a profound effect on my self-control then I have a hard time seeing how the myriad of other effects genes have on our brain can't also significantly alter our self-control.