We see the reports on Opioid addiction WW. Had to do some research after having children. I'm a recovered codeine addict. Only pain relief i had in labours was Pethadine and i always wondered when i was administered it, why it was that i felt at home. Turns out my Mom got the same relief during childbirth. And so it continued. Don't mean to distract Anons. It starts before we are born.

https://news.bbc.co.uk/2/hi/health/978721.stm

https://midwiferytoday.com/mt-articles/drugs-in-labour/