[ptaipale]

Same here, but I take that 0.2 litres every hour during a 9-10 hour workday.

I have noticed that if I don't get caffeine, I have a headache within a day. It lasts for about 3 days, or up to week. Then the cold turkey is over. I switched to green tea for 1.5 years when living in Asia (quite bad coffee, sorry) and then started again with coffee.

Decaffeinated is not popular here (e.g. our office does not have it) but Finnish coffee is no espresso so it's not that strong in caffeine. I prefer espresso beans though, not the light roast that is typical here.