[RogerBW]

In the 1990s many of my role-playing meetings were in pubs. We probably didn't drink as much as typical customers over the same time, but we'd often have 2-4 pints over an evening (some people preferred soft drinks). (This was in London, so public transport was how we'd got there and how we'd planned to go home anyway.) I don't think it made any particular difference to the games; the same player dead-sober versus slightly drunk was less variation in personality than there was between players anyway.