tecato gusano: the interior worm
the chilling Hispanic term for whatever interior disorder drives the addict back again and again to the enslaving Substance is tecato gusano, which apparently connotes some kind of interior psychic worm that cannot be sated or killed.
Context
The disease given its most physical name: not a choice or a weakness but a worm inside, driving the addict back to the Substance again and again, unkillable and unappeasable. The borrowed term does what the clinical vocabulary can't — it locates the compulsion as a living thing lodged in the self, with an appetite of its own that the addict merely serves.