Actually, by strict adherence to HN rules the headline should be "Think you drink a lot? This chart will tell you." (Which IMO is a perfect illustration of why this is a stupid rule.)
Seems a little misleading, as the population of drinkers is only 70% of the actual population.
We certainly don't claim to apply the rule correctly all the time. We are, however, happy to be corrected. The best way to complain about a title on HN is to suggest a better one.