I usually drink a couple of cups of green or black tea per day, usually with honey. At some point, when I was in the office, I was drinking up to 4 cups of tea per day. I was miserable at work, tired for other reasons, and felt like I needed it. I was probably pretty dependent on it at that time.

I understand very well how you might end up drinking a lot caffeinated beverages, but I wonder if you can have a placebo effect by drinking water and taking a quick walk outside instead?