It injects alternative scenarios on relationship field, which most men assume will happen in real life. It develops "ideal woman" template in your mind what make regular women unattractive. Men compare regular women to those from mp4s. It destroys manhood, make you hungry of body instead soul, personality, human. Its distraction from your daily routine, weakens your motivation and self-discipline. It affects your education, work, family, productivity.
Longtime addiction require couple years of efforts to break with that habit, but its possible what can confirm porn ex-addicts.
I agree. I didn't notice any of these effects when I was young, but it has a way of sneaking up on you over a long period of time. I wish I had been taught about the consequences of using porn and excessive masturbation when I was a young man instead of being told it was a sin (without any reasoning behind it).