Maryland Code, Health-General § 24-506

(a) Signs that state “Smoking or Vaping Permitted in This Room” shall be prominently posted and properly maintained where smoking or vaping is allowed under § 24-505(2) of this subtitle.

(b) Signs that state “No Smoking or Vaping” shall be conspicuously posted and properly maintained in each indoor area open to the public and each public entrance to an indoor area where smoking or vaping is prohibited under this subtitle.

(c) The signs shall be posted and maintained by the owner, operator, manager, or other person having control of the area.

(d) The letters on the signs shall be at least 1 inch in height.