No actually. In my first year working, I felt like I was getting addicted to coffee, and I noticed a 22 year old who had a long commute who seemed to subsist on coffee in the morning, cigarettes in the afternoon, and beer at night.

He seemed ineffective and unable to concentrate, as if he was permanently sleep deprived, and the less he did at work, the longer he stayed working, and the less sleep he got, the more stimulants he took. Eventually he wound up getting nothing done while spinning his wheels, and got fired. I think he moved closer to his next job and did fine there, but I took the lesson and decided to short-circuit those tendencies by giving up caffeine, sugar, and alcohol for a month each year.