I have a anecdotal story regarding this:
Back in high school I went to a mixed choir and we always drank a few beers before a performance. Of course it wasn't authorized by the conductor but we were young and we gave too few fucks. We did this to relieve the performance anxiety but also to relax our vocal cords or so we thought. As a guy who got put into tenor and I had rather hard time hitting the notes without having a severe headache or throat pain I found that the use of alcohol, especially beer made it a bit easier. Yeah sure it made me pay less attention to what I was singing but I think at least in short term there were some positive aspects.