The center shall prohibit smoking in all indoor areas in accordance with COMAR 09.12.23. If smoking is permitted in exterior areas, the center shall establish and implement smoking policies and procedures that minimize the risk of fire. The smoking policies and procedures shall include at least the following provisions: The center shall prohibit smoking in any hazardous location where flammable liquids, combustible gases, or oxygen are stored; The center shall designate smoking areas with ashtrays of noncombustible material and safe design; Participants shall be supervised at all times while smoking; and If the center has an exterior designated smoking area, this area may not be located at the front entrance.