Not to pry, but did it start with a doctor's prescription for you?
The nurse came in and put something in my IV and I just stopped. The pain stopped. I stopped talking to my wife in mid-sentence. Everything was fine. My world just stopped and I liked it.
As the nurse left my wife asked what I was given and it was dilaudid, which is equal to heroin on the equianalgesic scale.
It was right then I understood how people become addicted to drugs. Like you, it convinced me to never try heroin or any other opiates outside of emergency medical care.