Is Pornography a harmful addiction?

Joshua Shea is a former pornography addict-turned-expert on a mission to get the world talking about pornography addiction, and the potential ramifications being a porn addict can cause. He's given a TED Talk, and written four books on the subject. His most recent book, I'm Reading This Book About Porn Addiction For a Friend, introduces readers who are struggling in early recovery, or looking for more information about a suspected addiction. It includes symptoms, stories of addicts Shea has worked with, and a series of activities to personalize the process.