How big a problem is heavy cannabis use?

Annie Lowrey has a well-thought-out piece about cannabis use disorder in The Atlantic. In my view, this is the most under-covered topic in the debate about whether – and, more importantly how – legalize cannabis.  I’m especially grateful to Lowrey for making me sound coherent; that doesn’t always happen.
Unfortunately, the editor who added the headline and subhead to the story misstated matters fairly significantly. (This happens so often that I now insist on having a voice in the headlines that run over my essays.)

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