the closer you get to GOD through prayer, bible reading, and doing HIS will, the further you get away from that sin.
you can renounce it, be prayed for deliverance on it, but if you dont show self effort in seeking GOD and shunning away from ALL porn sources, EVEN putting softwares that block that thing in your pc, and even destroying the cds, the tapes, deleting the videos etc. you will fall back into the sin.