Each school board shall develop and implement a policy to prohibit, at any time, the use and distribution of any retail tobacco product or hemp product intended for smoking, as those terms are defined in § 18.2-371.2, on a school bus, on school property, or at an on-site or off-site school-sponsored activity. Such policy shall include (i) provisions for its enforcement among students, employees, and visitors, including the enumeration of possible sanctions or disciplinary action consistent with state or federal law, and (ii) referrals to resources to help staff and students overcome tobacco addiction. Each school board shall work to ensure adequate notice of this policy.