Facebook post by University of Helsinki

A study indicates that short-term opioid use shifts a range of emotional responses to the positive direction. This may be one of the reasons behind the onset of opioid use disorder. The findings indicate that emotional responses to external stimuli are mediated by the endogenous opioid system.
Short-term use of opioids increases subjective pleasure helsinki.fi

Emotional responses to external stimuli are mediated by the endogenous opioid system.