Can you provide a source?
MDMA is known to not be physically addictive, yet using any substance that overuses dopamine receptors (called opiates, which MDMA is not classified under) is extremely addictive. I've taken XTC and it never made me feel depressed afterwards or "not-happy".
This depressed or unhappy feeling can be explained because taking Xtc causes your brain to release all these chemicals that were built up. After taking it, your body does not have enough to keep happy without it.


