If you're drinking regularly and in large amounts like that, your tolerance for alcohol is going to be quite high, and your hangovers much more benign. If they

If you're drinking regularly and in large amounts like that, your tolerance for alcohol is going to be quite high, and your hangovers much more benign. If they quit drinking for a few months and then tried to drink like that again, they probably wouldn't make it through the night, and the next day would be rough.