Sorry, gsbtech. I've been reading this all, but I don't really have the time right now to respond properly.
The only things I can say about pron vs drugs is that you need to first examine the key differences between the nature of pron and the nature of drugs. I think you'll find some very clear differences.
To be aroused by beauty is a natural and instinctual response we are supposed to have. It is not an artificial sensation gained. Like any good thing, our attractions can become addictions. You can have a pyschologically "unhealthy" addiction to just about anything. When you pass over the line from where it's your instincts causing your arousement, to where you require the porn to become aroused (or to the point when a fetish must go to the extreme) then you've run into a problem.
You can't really stop something like porn, because it's simple human desire. The nature of pron can be controlled (such as banning child pronography), but the only way to put up a front against pron all together would be to protest for the sterilization of our kind...a novel idea, with merit...but probably not what we want to accomplish.
The risks for looking at pron on the non-extreme end lend really only to moral and social-ethical standpoints. To a mild degree, sex is just part of life. To a moderate degree, the pron is an indication of a social problem which most would agree should be replaced with something real (like an actual girlfriend instead of playboy mags). To an extreme degree, aside from psychological aid available, we have laws protecting us.
We have much stricter laws and bans on drugs vs pron, because the risk from someone carrying a wallet of breast pics around is far less than the risk of someone carrying drugs around. There's nothing to prevent you from carrying a nekked pic around in your wallet (and some, bachellors included, would probably say that is almost required). However, if you take that picture out in public, you have broken the law...for obvious ethical and social reasons (based on our society).
Alright, back to work.