People who have drank a lot have damaged some of their nervous system which can increase your tolerance to just about any sense...pain, and nausea in this case...the drinker would take the alcohol very easily but may expel it with vomiting or other sub sequential ways...others may be born with a high tolerance...some people are just stupid
They may just have an alcohol problem. Social drinkers don't normally do that. I could drink anything straight out of the bottle when I was on my downward spiral. Thank God I'm grateful I don't want or have to exist that way today.