title: Do we need objective measures to validate self-reported smoking?
mesh_terms: D000293:Adolescent; D002648:Child; D004739:England; D006801:Humans; D012463:Saliva / Q000378:metabolism; D012907:Smoking; D013861:Thiocyanates / Q000378:metabolism; D014342:Truth Disclosure
chemical_list: D013861:Thiocyanates; C031760:thiocyanate