Proverbs 23:35

Now the drinker hurts himself. But he might not feel the pain.

The next day, he might feel terrible pains. These pains are called a ‘hangover’. But the drunk does not learn from his error. He will make the same mistake again, many times.

This is because alcohol confuses the brain. The drunk does not realise that he must refuse alcohol. He thinks that he needs more alcohol. He supposes that alcohol will cure his problems. Really, alcohol causes all his problems.