It should be something that the government is actively campaigning against. If they can spend a fortune to "fight" tobacco, which is legal, they can certainly start a campaign discouraging porn, which is legal and probably a lot more destructive in the long run.
And porn should certainly not be something that is forced on people at every turn - on the internet, in magazines, etc. It's got to go back to the dirty old man environments in which it used to hang out.
This is primarily a male problem - men are much more visual than women are, and seem to become addicted to increasing levels of sexual perversity and violence as a kind of trigger. I have a friend, young and attractive, whose husband never slept with her because he was watching Internet porn. When she finally divorced him, she discovered that he had charged something like $40,000 in porn bills to her charge cards.
Good points, livius.
The State governments can if they want. "Campaigning" against tobacco is not supposed to be part of their job any more than "campaigning" against pornography. You act as if every abuse of the government by the left entitles you to an equal abuse of your own.