The term "stronghold", as far as I can tell, is nowhere in the Bible. It is a new age way term intended to take the blame off of man's deceitful, wicked nature and shift all the blame onto Satan. He doesn't make us do anything, he may whisper into our ear, but ultimately, we are the ones who make that decision. Yes, it is true that we wrestle against the powers of darkness, but he cannot rule our lives. I do not believe pornography is an addiction along the same lines as smoking, alcohol or drugs. Smoking, alcohol or drugs all have chemicals in them that cause the body to crave it when it does not have it. (Alcohol to a lesser degree.) Pornography is fully involved in man's wicked nature. The psychologists of today have made people believe that it isn't their fault, but it is society. New age "Christians" have made people believe today that it isn't their fault, but is is Satan. If you are truly saved, and you are truly repentant, then you will turn away from it. Yes, from time to time, you may falter, stumble etc., but you will NOT continue to live in the sin. Like another popular topic on the board lately, pornography is a choice you make. You can choose to live that way, or you can take it to the Lord.