(Also not a doctor.)

Your liver is pretty unique here, as most other organs don't grow back (they get covered in scar tissue if they grow back at all). You can donate your liver, they'll remove about half, and it'll be back to normal in about 2 months.

Makes you smarter too. Your brain can only operate as fast as the slowest brain cells, and alcohol tends to kill the weakest brain cells first. It's like culling the herd, you speed everything up.

(.../s)