36 CFR 2.21 : Parks, Forests, And Public Property (§ 1.1 To Parts 1601-1699) — (§ 1.1 To Parts 80-199) — National Park Service, Department Of The Interior (§ 1.1 To Parts 80-199) — Resource Protection, Public Use And Recreation (§ 2.1 To § 2.62) — Smoking.

4 Aug 2016

(a) The superintendent may designate a portion of a park area, or all or a portion of a building, structure or facility as closed to smoking when necessary to protect park resources, reduce the risk of fire, or prevent conflicts among visitor use activities. Smoking in an area or location so designated is prohibited.

(b) Smoking is prohibited within all caves and caverns.

36 CFR 2.21