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Many Vietnam veterans were treated in hospitals with heroin, yet they didn't become addicted.And many did, I assume. Were there studies that unequivocally showed that the non-addicted had good jobs, stable relationships, and a purpose in life, etc? There are lots of stories of successful college students, etc., who start dabbling in drugs and spiral down despite having all their ducks lined up in a row.
It seems to me that it's just as likely down to genetics. Some people are predisposed to addiction to certain things, and some aren't.
As a dumb anecdote, I smoked briefly after college because my girlfriend did. When I stopped dating her, I stopped smoking. I tend to think that I'm probably not predisposed to nicotine addiction.