title: Inorganic particles in cigars and cigar smoke.
abstract: A number of crystalline and optically isotopic inorganic materials are used in the manufacture of reconstituted tobacco sheets. These sheets, used primarily in inexpensive cigars, often contain diatomaceous earth, which exists in part in the silica mineral form cristobalite, a known fibrogen. Diatom fragments with this crystalline form have been observed in the main smoke stream of cigars made with these tobacco sheets.
mesh_terms: D006358:Hot Temperature; D008854:Microscopy, Electron; D010947:Plants, Toxic; D012822:Silicon Dioxide / Q000032:analysis*; D013696:Temperature; D014026:Nicotiana / Q000032:analysis*; D014961:X-Ray Diffraction
chemical_list: D012822:Silicon Dioxide