Like the man said, I'd like to see the supporting data.
Sure I'll do Your work for you
Prevalence
Percent of adults who drank alcohol in the past year: 62.7
Percent of current drinkers who had five or more drinks on at least one day in the past year: 32.2
Source: Health, United States, 2004, table 66 http://www.cdc.gov/nchs/fastats/alcohol.htm
So Last year more than 50% of alcohol users drank very heavily. Even those who had 3 or 4 drinks were drunk enough to not be able to drive legally.
But 90% of alcohol goes to toasting a farewell, cool of on a hot day, or enhance the flavor of meat. Only a tiny few do it for the buzz. Sure.
Perhaps. I'll bet the figure was much lower during Prohibition.