title: Cotinine conundrum--a step forward but questions remain.
authors.forename: Margaret R
authors.initials: MR
authors.lastname: Spitz
authors.forename: Christopher I
authors.initials: CI
authors.lastname: Amos
authors.forename: Laura J
authors.initials: LJ
authors.lastname: Bierut
authors.forename: Neil E
authors.initials: NE
authors.lastname: Caporaso
mesh_terms: D002884:Chromosomes, Human, Pair 15; D003367:Cotinine / Q000097:blood*; D006801:Humans; D008175:Lung Neoplasms / Q000209:etiology*; D020641:Polymorphism, Single Nucleotide; D011978:Receptors, Nicotinic / Q000235:genetics*; D012907:Smoking / Q000235:genetics*
chemical_list: D011978:Receptors, Nicotinic; D003367:Cotinine