2 drinks a day is not “heavy drinking”. It’s a MADD statistic.
Try a fifth of vodka (or more) a day.
2 drinks a day is a ridiculous standard for heaving drinking. Most adults can metabolize one drink an hour so technically you could drink a beer every hour of the day and never get intoxicated. Of course, there are other factors involved and everybody's different. And I wouldn't recommend having a drink an hour on an empty stomach either.
Winston Churchill and John Adams are examples of "so-called" heavy drinkers (by today's standards) who both lived to be 90 with no dementia.