I think that most of the scientific community agrees that alcohol causes cellular damage/apoptosis in the brain. Neurogenesis is not studied that much, so mostly you are born with generally a fixed number of neurons in your brain. If you think that losing neurons out of the billions you have is not a big deal, then I guess you can just keep getting drunk. I'd usually say that the percentage of alcohol in a drink is important, but if you are getting to the drunk level, all that matters is the percentage in your blood. Therefore, drinking a "mild" drink like beer can be just as bad as drinking vodka.
Anyway, I don't know if there are detailed studies. The risk is up to you. I have heard some claims about loss of myelination with prolonged alcoholism which can cause the slowness of thought associated with many alcoholics. And while some famous artists or politicians have been drinking a lot, these are not good examples or a green light for you. They are not the brightest to begin with. I have yet to learn about a single successful scientist-alcoholic.If you find one, please share. It's an oxymoron to claim that Shrodinger, Feynman, Gould, Kandel, etc, had a strong liking for a drink. Turgenev or Dostoevski is another matter (in general, stay away from Russian examples; Vodka is Russian for "water" and they do drink it like one).