Is Porn An Addiction?
What is the value of finding an answer to this question?
People are unlikely to unanimously agree on either a definition of addiction, or whether porn usage is actually an addiction. There are differing opinions already in this thread, and that's ok.
The way I see it, the value of asking this question is in indentifying your view of, and response to, porn usage.
It doesn't really matter how you define addiction, and whether you think porn usage is an addiction or not. What is your response to porn usage? How do you view porn usage, and how does that shape your behaviour, and your view of other's behaviour?
Two people here might agree that porn usage is an addiction, but does that guarantee they will respond to porn usage in the same way? Probably not. So is there value in agreeing or disagreeing with the topic question itself? I think that value is probably limited.
I definitely believe there is value in this discussion here, but coming to an agreement on whether porn usage is an addiction is probably not going to be of great benefit. Hopefully those participating on this forum will agree that we don't want porn usage in marriage (or anywhere). I'm thinking the 'box' we label porn with (addiction or not) has various influences on our thinking and behaviour. I think it's wise to be aware of this in ourselves.
Discussion is good though, so I'm not against continuing the discussion, and in some ways I think maybe @PaulB was wanting to throw the question out there to just start a discussion and get us thinking through it all and expressing our thoughts (which is great now that we have this new format for TMB

Edited to add: I should have quoted @David, because I think he's saying the same thing I'm trying to say (but he probably said it much better than me)...
This is what I mean about how we label porn can influence our behaviour. Like @David said, do we downplay porn usage because we call it an addiction?Thinking about this discussion it seems to me that the question isn't so much one of definitions (i.e. is it valid to use the word addiction to describe habitual porn use), so much as one of pastoral care (i.e. do we downplay the sin by calling it addiction).