title: II.2.a General aspects.
mesh_terms: D000818:Animals; D006224:Cricetinae; D051379:Mice; D009374:Neoplasms, Experimental / Q000473:pathology; D009602:Nitrosamines / Q000032:analysis* / Q000633:toxicity; D010947:Plants, Toxic; D051381:Rats; D012906:Smoke / Q000032:analysis*; D014026:Nicotiana / Q000032:analysis*
chemical_list: D009602:Nitrosamines; D012906:Smoke