De or het morfineverslaving?

The correct Dutch article is:

de morfineverslaving

Rule Words ending in -ing: almost always de. See the rule

How to use morfineverslaving

the morfineverslavingde morfineverslaving
this morfineverslavingdeze morfineverslaving
that morfineverslavingdie morfineverslaving
our morfineverslavingonze morfineverslaving
your morfineverslavingjouw morfineverslaving
every morfineverslavingelke morfineverslaving
which morfineverslaving?welke morfineverslaving?
a big morfineverslaving / the big morfineverslavingeen grote morfineverslaving, de grote morfineverslaving