People line up for recreational marijuana

An employee prepares smell samples of marijuana flowers for recreational sale for customers to check on the fragrance of products at Exclusive Provisioning Center in Ann Arbor, Mich. on Dec. 1, 2019. (Robin Buckson / The Detroit News)

Kelly Savage, 25, of Ohio, left, with Karessa Elsberry, right, makes the first purchase of recreational marijuana at Exclusive Provisioning Center in Ann Arbor, Mich. on Dec. 1, 2019. Savage has Type 1 diabetes and also uses marijuana socially. (Robin Buckson / The Detroit News)

Kelly Savage, 25, of Ohio, left, makes the first purchase of recreational marijuana giving cash to general manager Nick Warra, right, at Exclusive Provisioning Center in Ann Arbor, Mich. on Dec. 1, 2019. Savage has Type 1 diabetes and also uses marijuana socially. (Robin Buckson / The Detroit News)

Tender Jacob Samways, right, hands over the purchase to Gregg Etzel, 67, of Dundee at Exclusive Provisioning Center in Ann Arbor, Mich. on Dec. 1, 2019. Etzel uses marijuana in place of opioids, which he has been off of for four years.

General manager Nick Warra, right, waits on Kelly Savage, 25, of Ohio, left, with Karessa Elsberry, 23, also of Ohio, bottom right, at Exclusive Provisioning Center. Savage has type 1 diabetes and also uses marijuana socially.

Tender Sabrina Gillman talks about the recreational marijuana selection at Exclusive Provisioning Center.

Consultant Kiersten O'Connor, right, talks about the selection of recreational marijuana at Arbors Wellness in Ann Arbor, Mich.

Kerry Dawe, 60, of Brighton, left, with his German shepherd, Otto, stands in a long line stretching about a block from Arbors Wellness.

Recreational marijuana being sold at Arbors Wellness.

A long line stretches about a block from Arbors Wellness.

Pre-rolled recreational marijuana for sale at Arbors Wellness.