title: Factors to consider when using expired air carbon monoxide in smoking assessment.
mesh_terms: D000388:Air / Q000032:analysis; D002248:Carbon Monoxide / Q000032:analysis*; D002263:Carboxyhemoglobin / Q000378:metabolism; D006207:Half-Life; D006801:Humans; D010507:Periodicity; D011650:Pulmonary Alveoli / Q000032:analysis; D012107:Research Design / Q000592:standards; D012119:Respiration; D012907:Smoking / Q000523:psychology; D000074606:Smoking Prevention
chemical_list: D002248:Carbon Monoxide; D002263:Carboxyhemoglobin