What are some of the causes of opioid use disorder?

!. What are the common natural and synthetic opioids? What are some of the causes of opioid use disorder? What are some of the outcomes of OUD? What are the biological, and social effects of opioids? How does dependence on opioids occur? What does opioid withdrawal look like?2. What are the hallucinogen-related disorders? What are the common natural and synthetic hallucinogens? What are the effects of hallucinogens? What are the etiologies, course, outcome, prevalence, and gender ratios for these disorders? What does hallucinogen withdrawal look like?