I don't really think one drug is far more addictive than another. It's more like people that like heroine get into a more hopeless cycle than people that like pot or beer.
It doesn't take very long to get addicted to alcohol. Low grade alcoholism is common -- where they don't drink a lot bit they need that drink in the evening.
People addict to all kinds of things. Games, gambling...the physiological elements are kind of the minor part...you just need to dry out and that part goes away in a few weeks.
Its the reason people like living on a certain drug -- that's the hard addiction part. And its very much a psychology/environment game.
Heroine doesn't turn people into heroine addicts -- it turns heroine addicts into shit.
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