The first two retail marijuana shops in Massachusetts are set to begin selling products to the public Tuesday, marking the first time recreational pot will be sold east of the Mississippi.

The Massachusetts Cannabis Control Commission has given the green light to Cultivate Holdings, LLC, which has a retail shop in Leicester, and New England Treatment Access (NETA) LLC, which is readying a store in Northampton, to start selling marijuana and marijuana products.

Both are set to open Tuesday at 8 a.m., and already know who their first customers will be.

Iraq veteran and medical marijuana advocate Stephen Mandile will buy a quarter-ounce of pot and edibles once Cultivate opens at 8 a.m., the Boston Globe reported.

At the same time, Northampton Mayor David Narkewicz -- an Air Force veteran -- will walk into NETA and purchase an edible, according to the newspaper.

The dispensaries are expecting to see a huge influx of customers from across the region.

To purchase recreational marijuana, customers must be at least 21 years old and present a valid government-issued photo ID.

Cultivate will open Tuesday from 8 a.m. to 8 p.m. and customers may begin lining up as early as 7 a.m., although there is no overnight camping or line holding allowed.

The dispensary said a food truck and DJ will be on site.

NETA will be open from 8 a.m. to 10 p.m. Local police will also be assisting with potential traffic issues, while NETA staff will be outside to give customers direction and assistance.

Both dispensaries accept debit and cash transactions.

Customers will be allowed to purchase up to one ounce of pot -- the amount that state regulations allow individuals to possess in public at any given time -- although given potentially large crowds Tuesday, the businesses may keep their per-person limits fluid.

In addition to flowers, the dispensaries will sell edibles, oils, pre-rolled joints and other products.

State regulations allow individuals to possess up to 10 ounces of marijuana in their home at one time, as well any marijuana produced by plants cultivated on the premises.

Cultivate is located at 1764 Main St. in Leicester.

NETA is located at 118 Conz St. in Northampton.