There's a precedent for well-bred girls addicted to the paranormal.
I get the feeling that after the 'girls' you should say 'to have addicted' instead of the past verb 'addicted'.
And if you want to stick to the 'addicted', you should switch 'precedent for' into 'precedent of'. Then we can see 'addicted' as a past participles, not a verb.
Am I right? If not, please correct me.