When I was in my 30s/40s, I had a housemate who was a serious alcoholic. I would usually be the one to do the beer runs, and my housemates would give me some money for it. I think I tended to buy Bud Ice or something like that. I'd get four cases (30-packs) a week, and that sucker would put away half of that! He would out-drink both me and my other roommate combined. And he was only like 120 pounds, soaking wet, whereas the other housemate and me are more like 190-200. I have no idea where he used to put it!
But, considering that's still a 30-pack for me and a 30-pack for my other housemate, which comes out to 4 beers a day and a little extra on the weekends, that wasn't exactly good for us, either!
I finally got fed up and kicked the alcoholic out. And suddenly noticed my alcohol consumption was going down. I notice that when other people drink, I'm more likely to do it, myself, so I can definitely see the social aspect/subconscious peer pressure of it.
My other housemate, the one who stuck around, eventually cut back to where he only drinks on his days off. Once I started working from home in 2020, I noticed I did start drinking more, as it was easy to just go downstairs, raid the fridge, crack one open, and then do a DWW (Drunk While Working!) Although I wouldn't do it to the point that I got drunk!
Eventually that tapered off again. These days, I probably average one beer a day. Every once in awhile I might do two, but then there are days I don't do any at all. I might do a shot of something from time to time, but that's not a common occurrence.
As for my former roommate who was the alcoholic, I do keep in touch with him from time to time. Turns out he hit rock bottom soon after moving out from my place, and then got himself off the stuff completely.