Maryland Code, Business Regulation § 16-209

(1) shall place each package of cigarettes in the machine so that when the package is visible the tax stamps required by § 12-304 of the Tax--General Article are also visible; and

(2) in the way that the Executive Director requires by regulation, shall:

(c)(1) A licensee shall post a sign in a location that is clearly visible to the consumer that states:

“No person under the age of 21 may be sold tobacco products”.

(2) The sign required under this subsection shall be written in letters at least one-half inch high.