That's a single drug. That's not what I had in mind by widespread.
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Most people, I think, would interpret the word widespread, as used in this context, to mean "used by a lot of people", "pervasive", or something like that.
That you wish to exclude alcohol from being included in your definition of "widespread drug use" very much diminishes your point. I don't think it is helpful in these discussions to pretend that alcohol is not the most abused drug in America.
How about caffeine? How about nicotine, since it's worse in ways that cocaine and heroin according to dangerousness factors that drugs are measured by.