For the dreams - Thats because the time one spends high... how do I say this... the things in one's life that are very important to that person and are somewhat muted while high. It's a recreational activity, so that doesn't seem so out of place when one is doing it or considering it, but when one takes a break from it, those things start to come flooding back and one's dreams are the first place it manifests.

thus, I would argue it's not withdrawal the way tobacco or caffine withdrawals. It's not so much your body adapting to the absence of the substance as it is your conscious mind.

Same holds true for eating. tokers often condition themselves to eat when high. That takes some deconditioning.

I think, 20 years from now, after its been legal for some time.... we will collectively look at recreational mj as something that should be done on weekends. I think, in Amsterdam they are clear that its not something people should do every day. for those who need it as medicine, I am sure we will find methods of therapy that will help the patient deal with any of those subconscious feelings that mj somewhat mutes.