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Good info. I studied pharmacology with the intention to pursue a clinical career some years ago but it never panned out, so most of that info has been lost in the sands of time for me.That's really cool, valuable information. I'm not a dr but it seems to me might give a good indication of the cause of the headaches. Caffeine is a vasoconstrictor, codeine is a powerful opioid, it's impressive that the extra (possible) constriction could have as much effect as the analgesic effect of the opioid.
You are probably better off this way, side effect wise.
On topic, I hardly ever drink coffee or tea but use caffeine tablets and theanine. The theanine seems to allow for using caffeine a bit later in the day without affecting sleep as much. Both coffee and green tea have some other positive attributes though.
A-I is changing the game however and tapping that question into Gemini just now suggests that vasocontraction hypothesis may well be exactly correct.
Long term use of acetaminophen in particular is super not recommended, and I've basically overused that crap for years so seriously hoping no long term damage has been done.
As a diuretic caffeine/coffee has proved a health benefit, drinking more "adjunct" fluids and being healthier like that.