[Code of Federal Regulations] [Title 36, Volume 1] [Revised as of July 1, 2007] From the U.S. Government Printing Office via GPO Access [CITE: 36CFR2.21] [Page 25] TITLE 36--PARKS, FORESTS, AND PUBLIC PROPERTY CHAPTER I--NATIONAL PARK SERVICE, DEPARTMENT OF THE INTERIOR PART 2_RESOURCE PROTECTION, PUBLIC USE AND RECREATION--Table of Contents Sec. 2.21 Smoking. (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.