Just like with any substance - daily use increases tolerance of the substance and it's side effects. This includes "hangovers" for habitual over-indulging drinkers... they don't get hangovers like someone who drinks occasionally and then overdoes it at a party.

> No drinks at the Xmas party.

Because people can't be trusted to behave or? Sounds a bit extreme...

> My wife's company even serves wine at their cafeteria

Seen that but I think very few people consider buying it. Maybe last day before a vacation or similar (once or twice in a lifetime).

Impairment for e.g. driving isn’t so great but as far as just before work—how many people are on prescription mood-altering drugs? The potential for abuse is worse with self-medication (well—I mean, hypothetically, but see also opioids) but I don’t per se see “I like to stay a little high at work, makes my day a ton better” as a significantly worse than “I take a Wellbutrin each morning, makes my day a ton better”.