My small opion is this and i've heard many oldtimers say this and found it to be true...
Its not how much you drink, its not how often you drink,Its what happens to you when you drink,
Some people are lucky and can grink that amount and are not affected phisicaly or mentaly for that matter. And are lucky to remember everthing the next day but there are to those of us how are the oposite and not so lucky and for us we need help like AA or somesort of program.