Is there any relation between how a person's body metabolizes anesthesia and pain medication?

As for the anesthesia, well that's most likely due to the type of anesthetic used, the amount and your tolerance. Which I know as a child you didn't have, but they tend to go with less on children than normal, and perhaps your body takes more to knock you out. As for the oral surgeon, they say you're under a general anesthesia, but it's nothing like what you get in a hospital surgical setting. Otherwise, they'd have to have an anesthesiologist there monitoring your oxygen levels and you would have been given a paralytic, which cause you to become paralyzed during the surgery, in case you tend to move or thrash about while out. That's why they strap you on the bed, as well. I do know that if you have any kind of major surgery as an adult the anesthesiologist will talk to you about any problems you've had in the past with a general and you would be sure to bring up all of these instances, then they're aware of it and modify the medications as deemed necessary. As far as I know there is no correlation between the absorption of medication or anesthetic and your metabolism. Like I said I've had over 13 spinal surgeries, one shoulder surgery, one sinus surgery, my tonsils taken out, a hysterectomy and several trigger point injections all using general anesthetic and I've never woken up, and my tolerance is extremely high!