yeah, i haven't had experience with opium. but last weekend i smoked some heroin with a friend, we'll say. basically it just put me on my ass, feeling well and dreary, having some rushing, and then i slept the sleep of angels. it makes you very relaxed and sleepy and dreary , and a very warm and comforting sensation comes over you. your mind is more quiet. it just feels really good, it doesn't fuck with your head much. smoke a couple of bowls with it, which is always better in my experience.