Been in the adult biz for almost four decades and until I ended up living in the US for a while, I never heard of "porn addition"
Smells like another "disease" generated by whoever for whatever purpose, but... there is bound to be *someone* who is possibly "addicted" to an obsessive level, so hell knows...
Presumably an individual who manages to waste most of his time eg on the net looking at crap and maxing out his cards on porn sites, may have a "little problem" - sounds more like a character deficiency or something similar..