OKLAHOMA CITY — Sales of medical marijuana in Oklahoma topped $73 million last month, the highest monthly total yet, the Oklahoma Tax Commission reported on Monday.

The data shows May sales generated more than $11.6 million in tax revenue last month, including $6.5 million in state and local taxes and another $5.1 million from the marijuana excise tax.

The medical marijuana business has been booming in Oklahoma since voters approved a citizen-led initiative petition in 2018 that made it easy and relatively inexpensive for patients, dispensaries and growers to obtain a license.