I think people fear that the heavy hand of the state - or employers wielding powerful economic incentives - will come down on alcohol as it did on tobacco. Once something is declared "unhealthy" there is strong pressure to eliminate it, as health and productivity are the twin goods of modern society. I'm a nonsmoker, but I feel for that group of smokers (mostly pipe and cigar afficionados) that have had one of their major pleasures curtailed.