addict
noun
°A person who is addicted, especially to a harmful drug.
"He is an addict when it comes to chocolate cookies."
°An adherent or fan (of something).
verb
°To cause someone to become addicted, especially to a harmful drug.
°To involve oneself in something habitually, to the exclusion of almost anything else.
synonyms: junkie, slave, adherent, aficionado more» , devotee, enthusiast, fan, habitue, hooked, consecrate, dedicate, devote, adapt, fit