noun
a person who is addicted to a particular substance or activity
verb
to cause someone to become addicted to a particular substance or activity
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The psychiatrist is treating a patient who is a drug addict.
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My cousin is addicted to playing video games all day.
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I used to be a coffee addict but now I've switched to tea.
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She's a self-confessed book addict, always with her nose in a new novel.