so saying the purpose of alcohol is to damage one's health seems incorrect.
No, sorry. What do you think intoxication
is? It's poisoning. The
aim of consuming alcohol (for the most part) is to achieve some degree of intoxication, whether it be gentle buzz, a little loosening of social anxieties, mild stress relief, not-so-mild stress relief, right through to getting throwing-up-blacking-out-and-waking-up-in-a-ditch drunk. All of those scenarios involve poisoning yourself, because that's what alcohol intoxication is, the difference is degree.
As someone who is almost certainly fonder of a drink than they should be, I say this not as some kind of prohibitionist puritan, simply as someone who's tried to make an informed choice about how much of a trade-off I want to make between inevitably shortening my life, and having a few vices that help to make life worth living.