A medical or psychological condition resulting from habitual or excessive use of caffeine; a dependency on or addiction to caffeinated substances.
From caffeine plus the suffix -ism (indicating a condition, practice, or system). This term is largely synonymous with caffeinism and emerged in medical discourse to describe caffeine dependence.
Caffeism and caffeinism mean almost the same thing, but scientists sometimes prefer one over the other in different regions—it's a reminder that even in international science, there's no single 'right' word, just conventions that different communities follow.
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