Alcohol at work? Plenty of stories.
Working as a welder in the factory in the 70's it was normal to take turns buying a 12 pack while out for Friday lunch and share it during the afternoon. We wrapped a shop rag around our cans and the plant manager turned a blind eye. The damn painter always bought Schlitz though.

Never drove home drunk, dad was working there in engineering and drove, but I got a few side glances.
In the corporate world when we were in our late 20's we would always pop a few beers with a vendor when he/she took us out to lunch.
Friday lunch was often at a bar with coworkers. One guy who was a really high IQ physicist would just slam beers.
The golden era of trade shows in the 90's were in a category all their own. Not a sober breath was drawn all week.
Worked with a manager who kept a bottle in his desk. I later found he was hammered most of the time at work. Essentially drank himself to death at an early age. Very sad.
Talked to a German immigrant who once worked as a farm implement dealer mechanic in Iowa. They had to tell him it was not customary in the USA to consume a 6 pack after lunch on Fridays.
Worked with one of our Australian distributors. He said they had a beer fridge in the office and start imbibing Friday afternoons. (See a pattern here?) He had to quit after his second DUI. In Australia you are compelled to blow into the tube.