Jack likes a drink and a standard night out will probably involve several pints at his local.
"If you have three pints, that is easy, easy going," the 29-year-old says. "Probably a heavy night, casually, would be like six-plus pints."
Jack grew up in County Galway where, he says, young people often start drinking at 14 or 15, "usually in a field with a horrendous can of cider".
"And then, when you're 17, your dad brings you to a pub, buys you your pint of Guinness, and that's where it takes hold."
Ireland has a complex relationship with drinking and many see alcohol and socialising as inextricably linked, part of the social fabric of everyday life.
