I believe Coffee is an addictive substance well suited for human beings. Although it is addictive, it is self-limiting. Most people will naturally stop drinking it at the sweet spot.
I have one strong moka pot of coffee a day, say 400ml cup. If I stop having coffee for a week or two now and again, I get a headache the first day or so.
That seems a much smaller 300g ration per week. I get through a 200g bag of fine ground coffee in a couple or three weeks at one strong mug a day or there abouts.
In a high stress startup environment that provides an unlimited amount of coffee and energy drinks and always seems to be in crunch mode, it's easy for your caffeine consumption to creep up to "could kill a horse" levels. I've seen it happen to others. I've had it happen to me. The end results aren't nearly as bad as, say, alcohol addiction, but it's still not something I want to live through twice.
> Most people will naturally stop drinking it at the sweet spot.
Putting an "I believe" before a claim like that is insufficient, given the evidence of people who are anywhere but at a so-called sweet spot.