But you have to calibrate yourself, and some people find it harder than others. Poor saps.

Perhaps drinking should be treated more like driving - you'd have tuition and have to pass a test before you'd be allowed to drink in a pub or buy it in a supermarket, except when you were being supervised by a qualified drinker, and wearing a big sign saying "LD"... And you could always lose your drinking licence, and maybe have to take the test again...