

So those studies don’t prove that alcoholism is hereditary, nor do they prove that it isn’t just nurture. Since they aren’t twin adoption studies they’re generally useless.
If we look at those instead, it does not suggest that alcoholism is hereditary, but that certain genes increase the risk of substance abuse. It’s not that child inherits alcoholism from the parent, but the predisposition for alcoholism is in their genetics. This means that even if a parent is not an alcholic, the child will still be more predispositioned for alcoholism, meaning the hereditary term doesn’t make much sense.







Think of it like this, 99.9% of the people with those genes did not become alcoholics throughout the history of those human genes existing.
Those that did did not transmit it to further generations through genes either.
So is alcoholism hereditary? No, we cannot say in any meaningful semantic sense of the word that it is.