Ooh loads. I was 18 in 2000 and has just entered the workforce!
Indoor smoking rooms. Offices and everywhere else in the buildings were non- smoking, but there were dedicated rooms, and smokers could go pretty much whenever they fancied, as late as 2005.
It being perfectly acceptable in an open plan office for the 'lads' to have copies of Zoo, Nuts, page 3, rudey calendars etc etc open and being read on desks/lying around everywhere - this was as late as the early 2010s!
Pubs visits at lunchtime where people routinely drank alcohol, and not just the one. Again, early 2010s.
General sexist culture - women being expected to wear skirts and heels, lap-dancing and golf trips for the male execs, office relationships that were totally inappropriate due to conflict of interests and power imbalances. Early 2010s.
I'm sure there's more! Maybe I just worked at some dodgy old places, but one was civil service!