I agree, it wasn't a great comparison. I didn't want to get too into the weeds on specifics since I figured the average person would lump them all under "psychedelics" or "hallucinogens". I just wanted to point out that the activation of opioid systems may be a contributor in its more addictive nature, but it's certainly not the only factor in its addictive potential. Especially so since those dissociatives that activate dopamine or opioid systems tends to be more addictive than their more selective counterparts.