excessive intake of caffeine as "substance" abuse?
Not to the degree of narcotics or alcohol, but yes, anything that is excessive is abuse. Living serenely is about balance. Anything that takes me off that is a problem. I was over 12 years clean when I put down cigarrettes. I am still going back and forth with coffee. There is a fellowship that deals with all chemicals:
Chemically Dependent Anonymous Online Resource Center - CDA