I just checked psychology today and came across something really interesting! This article is about dopamine, how it affects us, and how important it is. And of course how messed up things can get when you screw with the natural balance of it all. (As most of us here know)
Its lengthy but worth the read. Anytime you see the word 'drugs' replace it with porn/masturbation lol.
Just more motivation for everyone who is trying to quit.