In this Nov. 30, 2018, file photo, medical marijuana dispensary owner Chance Gilbert displays some of the marijuana he's grown at the Oklahoma Roots dispensary in Shawnee, about 40 miles east of Oklahoma City. Oklahoma tax officials say medical marijuana sales topped $12 million last month, marking the sixth straight month of explosive growth for the new industry. (AP Photo/Sean Murphy, File)

In this Nov. 30, 2018, file photo, medical marijuana dispensary owner Chance Gilbert displays some of the marijuana he's grown at the Oklahoma Roots dispensary in Shawnee, about 40 miles east of Oklahoma City. Oklahoma tax officials say medical marijuana sales topped $12 million last month, marking the sixth straight month of explosive growth for the new industry. (AP Photo/Sean Murphy, File)

OKLAHOMA CITY (AP) — Oklahoma tax officials say medical marijuana sales topped $12 million last month, marking the sixth straight month of explosive growth for the new industry.

The Oklahoma Tax Commission reported the state collected more than $870,000 in March from the 7% excise tax on marijuana. The state collected an additional $1.2 million in state and local sales tax on medical pot in March.

Medical marijuana sales have grown significantly each month since dispensaries began selling cannabis in the October.

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The number of patients also is skyrocketing. The Oklahoma Medical Marijuana Authority says they’ve issued more than 83,000 patient licenses since August. They’ve also licensed more than 1,200 dispensaries and 2,300 commercial growers.