How forgetful are alcohol drinkers ?

Adolescent drinkers showed 10% decrease in ability to recall information, comparing with those who don't drink.
Based on the measuremnet done on teenage drinkers, the size of hippocampus of drinkers is 10% smaller than non-drinker. Hippocampus is the part of brain that handles memory and learning.

Source: Health Magazine, January/Febuary, 2006