Why? There are plenty of vices that are completely legal. Who cares what he does on his own time so long as it doesn’t affect his ability to do his job? There’s a perception that just because something is classified as a “drug” that it’s some horrible, awful thing. Well guess what? Caffeine, in coffee, which oodles of people drink, is also technically a drug. Do you think people are idiots for thinking drinking coffee is okay?