It's no wonder we've been boozing so hard as a species for who knows how long that we have evolved purpose built genes for our livers, kidneys, brain, endocrine system, lymphatic system, cardiovascular system, digestive system, basically any system in your body to actively tank alcohol head on the way we do as a species. Most animals only need 1/4th of what we do by weight to get drunk and by then they risk alcohol poisoning. 