SAN FRANCISCO — It was 8 p.m. and pitch dark when it dawned on me: I should not be smoking hashish in the rain behind the Greyhound station before my red-eye ride to Humboldt County.

Igzactly 420 was approximately three blocks away and wouldn’t close for two hours — precisely 10 minutes before my bus departed.

A seven-minute walk later, the medical cannabis dispensary and vaporizing lounge became my port in a storm, one of San Francisco’s models of public social cannabis consumption — a flaming-hot issue in states that have legalized recreational cannabis use by adults.

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