@giujohn,
That's completely wrong, there are other trace alcohols and flavourings from whatever is used to create the spirit. They give it an individuality and depth. You can get a hangover from vodka just as easily as any other spirit.
Everyone has their own, I don't like whisky, but have a great deal of respect for those who like a single malt. Can't say that of vodka, cheap industrial, flavourless, the Russians drank it because that's all they had.
This is what I drink.