All retailers shall store permissible fireworks in the original unbroken containers in which such fireworks were shipped and received. Any such fireworks that are displayed or offered in bulk outside such original containers shall be displayed in accordance with rules and regulations promulgated and adopted by the State Fire Marshal. No fireworks shall be displayed in windows or where the sun may shine through glass onto the fireworks. At all places where fireworks are stored or sold, the area used by the patrons shall be unobstructed, with clear access to an outside door. Such areas where fireworks are stored must have posted signs containing the words "Fireworks for Sale--No Smoking Allowed" in letters not less than four inches high. No person under the age of eighteen years shall be employed as a salesman or handler of fireworks.