My sister has about the same appetite for alcohol as I do; she loves drinking and if there is someone with her who keeps drinking (me; before I stopped) will have a few more with them. She actually uses the word 'craving' about wanting a glass of wine. But she is also very aware of safe drinking guidelines, and regularly catches her consumption creeping up over time and pulls it back. She usually does a dry February.
I think she has the same potential as me to become an alcoholic, except that I didn't discipline my intake. She lives with her husband and that's a restraint I don't have. I've often wondered if she's my genetic twin except that I went down the progressive path and she didn't.
PS a lot of her present attitude to drinking, which is watchful and wary, has been informed by me being a member of SR and telling her all the new stuff I've learned.