NANTUCKET, Mass. (AP) — Nantucket’s first pot shop is up and running.

The Green Lady Dispensary opened Sunday on an appointment-only basis on the Massachusetts island after receiving approval to operate from the state’s Cannabis Control Commission.

Massachusetts voters legalized recreational pot for adults in 2016, but marijuana businesses faced additional obstacles to opening off the mainland because it remains illegal to transport marijuana through federal waters, or to fly it there.

The Green Lady Dispensary is cultivating marijuana on the island and received permission from regulators to conduct on-site laboratory testing in lieu of the normal requirement that products be tested at a licensed independent lab.

The family-run store says appointments will be required through Labor Day.

The island of Martha’s Vineyard has a medical marijuana dispensary, but as yet no retail outlets.