I don't think that this is a big problem at all we have a lot more serious problem than this,For example drug addiction and gambling addiction this two are more serious than porn addiction.Porn addiction couldn't harm anyone if they could control their self if you would think about it,It is better than any addiction because at least they wouldn't harm anyone unless the person isn't in the right state of mind in this case too much porn could lead to rape if they couldn't handle the lust or thirst for flesh.