As the soon-to-be-ex spouse of an alcoholic, follow what the PPs say who say to report how the issue impacts you.
At most places I am aware of, instead of this becoming something terrible, like immediate firing, it has the chance to become something good. Counseling through an EAP, perhaps even treatment.
Only when addicts face the consequences of their disease/choices head on do that even have a hope of changing (it's still a relatively slim hope, but it's there!), and that's what everyone wants.
And if it's not alcohol, then depression/health issues can still be addressed via an EAP.
Are they really hungover? I used to feel like this & show up like this to work when really it was just stress, poor sleep, & needing a new diet. I actually went to my dr because I thought something was seriously wrong.
Document how he, not his condition (whatever it actually is since no way you know unless on those days he comes in reeking of old alcohol) is affecting your ability to do your job properly, and/or that he is causing you more work.
If it has no affect on you, just irritates you, myob.
Anything that affects your ability to do your job effectively is your business. You don't need to bring up to your manager that you think he's hung over, just the ways his work is affecting yours.
How do you deal with this? They are never drunk on the job (fancy, white collar, comms in DC) but they are obviously hungover all the time, like 3 days a week.
I do not want to report them and I do not want to approach them to tell them the error of their ways. That is not my job or cross to bear. But I'm sick of moving at their slowed, dented pace.