This is an excerpt for discussion purposes, see article for full story. More and more Americans are reporting near-constant cannabis use, as legalization forges ahead. The proliferation of retail boutiques in California did not really bother him, Evan told me, but the billboards did. Advertisements for delivery, advertisements promoting the substance for relaxation, for fun, for health. “Shop. It’s legal.” “Hello marijuana, goodbye hangover.” “It’s not a trigger,” he told me. “But it is in your face.” When we spoke, he had been sober for a hard-fought seven weeks: seven weeks of sleepless nights, intermittent nausea, irritability, trouble focusing, and...