Physical addiction to drugs start with the spine. Prescription drugs and hard drugs always have reactions in the Central Nervous System, whereas, the only thing pot reacts with are the cannabinoid receptors.

Psychological addiction comes with instincts. The proof is in the rats and mice. You know, they are crackheads, but THC is one thing they won't self-medicate, meaning that admitting that you're addicted to pot is saying that you have less intelligence than a mouse or rat. And that's not true.