Updated 5:20 pm, Monday, June 11, 2018

Photo: Don Ryan, AP

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A marijuana plant is shown at a commercial grow in Springfield, Ore., May 24, 2018. Mayors from six U.S. cities where marijuana is legal have formed a coalition with the aim of preparing other states and the federal government for marijuana legalization. Mayors from Denver, Seattle, Portland, San Francisco, Los Angeles, Las Vegas and West Sacramento announced Monday, June 11, 2018, on Twitter that they had sponsored the resolution. less A marijuana plant is shown at a commercial grow in Springfield, Ore., May 24, 2018. Mayors from six U.S. cities where marijuana is legal have formed a coalition with the aim of preparing other states and the … more Photo: Don Ryan, AP

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Customers Robert Thompson and Ranita Reed look over a selection of marjiuana products at Harborside Health Center on the first day of recreational marijuana sales in California on Monday, January 1, 2018 in Oakland, California. less Customers Robert Thompson and Ranita Reed look over a selection of marjiuana products at Harborside Health Center on the first day of recreational marijuana sales in California on Monday, January 1, 2018 in … more Photo: Amy Osborne / Special To The Chronicle

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Humboldt Cannabis Tours founder Matt Kurth holds marijuana joints at Humboldt Alchemy Group on Friday, Jan. 12, 2018, in Phillipsville, Calif.

Humboldt Cannabis Tours founder Matt Kurth holds marijuana joints at Humboldt Alchemy Group on Friday, Jan. 12, 2018, in Phillipsville, Calif.

Photo: Noah Berger / Special To The Chronicle

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