I'm a drinker in principle, as in not being a teetotaller, but am just not attracted to drink very often. I probably have less than a bottle of wine and half a dozen beers a year. Same with drugs. I've tried most of the common ones, including those considered very addictive, but was never tempted to make a habit of any of them. Likewise food - I'm not an over eater and am in my late '50s the same weight I was 3 decades ago (though a little fitter since taking up running, which along with other sporty activities I abjured with exaggerated horror in my youth).

None of this has taken the slightest effort or even any consideration to be honest. Neither is this easy sobriety a consequence of some sort of well-managed successful life (au contraire - it's a mess).

Perhaps some of us just have naturally temperate temperaments.