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Anecdotal really. The questions that have to be asked are how many casual users become addicts 1 in 10? 1 in 100? Of those addicts how many have life ruining consequences? Is there a way to be functional?

If you start from the worst, something like: "OMG every time you walk in a room with an illegal drug you'll be turning tricks on the street inside of a week", then yeah it seems pretty awful. But if only a minority of people have a problem and accept the risk of being an addict who's to stop them? Being an adult means responsibility.