I doubt the author actually needed anything close to a year, physiologically speaking. But almost everyone has withdrawal symptoms when quitting a coffee habit.

I doubt the author actually needed anything close to a year, physiologically speaking. But almost everyone has withdrawal symptoms when quitting a coffee habit. Clinically, they call it dependence rather than addiction. https://en.wikipedia.org/wiki/Caffeine_dependence https://en.wikipedia.org/wiki/Caffeine_dependence