addict
ad·dict
/ˈædıkt/ noun , pl -dicts [ count ]
1 : a person who is not able to stop taking drugs : a person who is addicted to drugs
The clinic provides counseling for (drug) addicts.
a heroin/cocaine/crack addict
2 informal : a person who likes or enjoys something very much and spends a large amount of time doing it, watching it, etc.
a television addict [=junkie]
basketball addicts