This is similar to a friend of mine that read that those who play golf socially, live on average 10 years longer than those who don't. He's very unfit, drinks

This is similar to a friend of mine that read that those who play golf socially, live on average 10 years longer than those who don't. He's very unfit, drinks a lot and doesn't eat well - but gets a round of golf in 2 or 3 times a month. Now I agree 'the cohort of people that regularly play golf' likely do live longer than people who don't play golf - BUT that is not caused by the golf itself. Those who can play golf a) already can get out and do some light exercise b) have the funds to play so putting them in the top 20 to 10 percent of household incomes, c) have a family set up that allows them time away to play golf d) have jobs that leave them with free time and energy to play golf I could go on, but I'd argue strongly that it is not the GOLF that gives them the longevity of life. Same here with the drinking - what are all the others things that go with people being ABLE to socially drink (in moderation)? I'd argue the drink does not cause them...