Addict
Definition 1 of 3
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Negative Implication
Describes a dependency that usually has harmful consequences or is viewed negatively. Her brother became an addict after experimenting with drugs.
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Not Always Illegal
Can refer to legal substances or activities, like caffeine or video games, not just illicit drugs. I'm such a coffee addict; I drink five cups a day!
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Hyperbolic Usage
Sometimes used hyperbolically to mean someone enjoys something a lot, not an actual addiction. He calls himself a chocolate addict because he loves it so much.