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I'm not sure that's the comparison that's being made. At least the phrasing suggests they think it's more ongoing than "at least once".

> If you're looking for people who use crack recreationally

That seems to suggest something more similar to consuming "reasonable amounts" for an extended period. I personally don't know how common that would be (since I don't tend to hang around kitchens in restaurants) but it does sound rather different from "people that used crack at least once in their lifetime".