How?

My friend was recently prescribe some Percocet because she had surgery. Me, who loves oxy, asked her how she liked the Percocet. She told me how great and happy it made her feel, and I chuckled to myself (perhaps wrongfully) because that's the very drug that triggered me because it made me feel "great and happy".

She was only prescribed 5/325 but 1 pull totally did it for her she said. After her prescription was gone, however, she had no inclination to get a refill and she wasn't craving it, etc.

That makes me wonder...how is it that 1 drug can trigger a life of addiction for one person, yet if another person takes it and experiences pleasure from it, they dont get addicted. Granted everyone is different, but I'd love to get down to HOW and WHY. It's intriguing to me.
 
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