title: Are contaminants the culprit and not tobacco?
mesh_terms: D008855:Microscopy, Electron, Scanning; D009538:Nicotine / Q000032:analysis; D010947:Plants, Toxic; D012825:Silicon / Q000032:analysis*; D012906:Smoke / Q000032:analysis*; D014026:Nicotiana / Q000032:analysis* / Q000648:ultrastructure
chemical_list: D012906:Smoke; D009538:Nicotine; D012825:Silicon