This is not surprising to me at all. When I left a management position I decided to cut coffee to something like 100mg per day, down from something like a gram.

This is not surprising to me at all. When I left a management position I decided to cut coffee to something like 100mg per day, down from something like a gram. An espresso shot is 40/60mg, so this is basically only two cups per day or something, not much. I found that for technical work coffee was making it harder for me to control intrusive thoughts that are maybe work related but not related to the task I have to focus now. For management work that was not much of a problem and usually with a notebook and talking to whoever was in a meeting at that time with me I could deal with everything. Working in a more lonely setting while using a lot of caffeine was not easy. I quit smoking a couple of times, and cutting coffee was definitely harder.