addict (n)

She was a coffee addict. She had more than three cups each day.
The support group provides a safe space for recovering addicts to share their experiences and encourage one another on their journey to sobriety.
She was an addict of both caffeine and sugar, unable to go a day without consuming several cups of coffee and sugary snacks.
He recognized that he had become an addict of social media, constantly checking his accounts even during important meetings.