I’m not so sure. I was in a terrible accident some years ago (42 fractures) and was on Oxy/Percocet for five months. When the pain eased I had no desire to keep taking it. I was not addicted to it. “Addiction”?
I herniated a disc in my neck. Severe pain. Doc gave me a huge bottle of the strongest Vicodin. After about 2 weeks the pain started lessening and I started spacing out the Vicodin more. I got sick. Hubby said....yeah, you’re addicted. I walked right into the bathroom and flushed the rest of the bottle. Went through about a week of withdrawals and haven’t taken one again....even though I have severe pain from degenerative disc disease and a pinched sciatic.
everyones psyco make up is different, you got lucky
Some people's body chemistry makes them more vulnerable to addiction than others. This has long been clinically established with alcohol studies; I can only presume various opiods may affect some people more than others. American Indians, Irish, several other groups have been shown to be most vulnerable to alcohol.
Another aspect is the children of teetotalers such as Baptists or old-time Methodists who go away to university, try drinking and soon find themselves bingeing and addicted; because of their family culture they had no drunk uncles or granddads and they had no idea their body type may have been vulnerable.