A daily habit may contribute to longevity.

That’s why I choke down the swill ever morning. I’ve never found any other reasons to do so.

Speaking of my apparent imperviousness to caffeine, I was staying with an old (in both senses of the word) friend in Seattle last week, and he noted that since he’d gone more paleo in his diet, he noticed much less of a caffeine effect from morning coffee or evening tea. I started drinking it after I’d changed my diet as well, so maybe carbs enhance it. Actually, someone should do a study on that.