I'm aware of all that. People still overdose on opium frequently. Users that are more tolerant to the opioid nausea will not vomit as readily when ODing. The em

I'm aware of all that. People still overdose on opium frequently. Users that are more tolerant to the opioid nausea will not vomit as readily when ODing. The emetic effect is not as strong or as universal as you seem to think it is.