I think psychological dependancy is where you have no cravings but you think you want some, just to get the high.

As for physical dependancy, I think it is where you crave it alot, you NEED it to function, as in, it's your first priority to get some.
DataMatrix Reviewed by DataMatrix on . Habit forming and physical addiction Could someone define clearly what is habit forming (psychologic dependency) and what's the diference between it and physical dependency. Skip the obvious like psychologic is in the mind and physical is in the body... Also, I don't have this "habit forming" that marijuana supponsedly gives you. I just smoke when I feel like it (and have it). Rating: 5