addict · noun C /ˈæd.ɪkt/
addict
B2 a person who cannot stop doing or using something, especially something harmful
Dictionary examples:
a drug/heroin addict
a gambling addict
I'm a chocolate/shopping addict.
Learner example:
I like TV, I watch it but luckily I haven't become a TV addict yet. (First Certificate in English; B2; Russian)