It's just habit. "Oh I'm going on vacation. The vacation starts now. I have an hour before my flight. Might as well pop $20 and slam a couple drinks." At almost 50 I'm not quite giving it up but that habit drinking has stopped and it feels great. Not to mention saving money. I still let tequila jump down my throat during social time kicking it around the campfire or celebrating a friend's Bday. :)