It means that while he was taking opioid pain killers after surgery, smoking weed relieved the nausea caused by the opioids.
What he said makes perfect sense to me, I expect you just wanted to get in a dig at him for whatever reason.
I knew people understood what I meant. I had skin cancer removed from my nose next to the tear duct and tear duct still has the stint in and secretes and irritating fluid in my eye. I’m not a regular user. 121 cbd thc allowed to rest well after taking pain meds that made want to puke.