From Longman Dictionary of Contemporary Englishhabit-formingˈhabit-ˌforming adjective ADDICTEDa drug or activity that is habit-forming makes you want to keep taking it, keep doing it etc
Examples from the Corpus
habit-forming• Video games can be habit-forming.• Behind you are more than twenty years of habit-forming obedience to the house rules - and why not?• I sampled the oak-smoked back - quite the most succulent, aromatic and potentially habit-forming rasher I have ever had.• Murder was habit-forming, so I'd been told. 