Every health facility, as defined in Section 1250, and clinic, as defined in Section 1200, shall comply with the following:
(a) Shall make every reasonable effort to assign patients to rooms according to the patient’s individual nonsmoking or smoking preference.
(b) Shall designate and post by signs of sufficient number and posted in locations as to be readily seen by persons within the area, a contiguous area of not less than 20 percent of every cafeteria or other dining area whose occupied capacity is 50 or more persons as a nonsmoking section.
(c) This section shall not prevent any health facility or clinic from banning smoking in any area that it may designate and post by sign or in all areas of the facility or clinic.