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Quick Theory: The regular coffee drinkers are (on average) folks with more energy/time/money (which keeping up a coffee habit requires), or working (free & convenient coffee at the office), or other things that correlate with better physical & mental health.

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yes, this is mentioned in the article

> there may be other lifestyle factors contributing to that lower mortality risk among people who drink coffee, like a healthy diet or a consistent exercise routine

Coffee is dirt cheap. A kilo of coffee is around €8 and you can make ~16 liters or 80 cups with that.

That must be for people who hate coffee, or hate themselves, or both. Even the cheapest grocery store brand ground coffee that comes in buckets sells for $0.4/oz which is about twice the price you mentioned. Anything worth drinking costs $1/oz where I live.

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