Carbon Monoxide Breath Sensor System Performance, Human Factors, and Usability Assessment Conducted in a Single Visit

Performance: * Non-invasively measure carbon monoxide (CO) levels in the exhaled breath of study subjects using two different types of measurement devices. * Assess the correlation between the measured CO levels (in parts per million, or ppm) of the study CO breath sensor (Carrot Sense) and the predicate CO breath sensor (Bedfont). Human Factors and Usability: * Ensure that representative intended users are able to operate the COBSS independently. * Validate appropriate mitigations of use related hazards identified in risk management documentation. * Uncover previously unforeseen use errors. NOTES: * The study design allows for the assessment of a performance endpoint and human factors endpoint in a single study. * Each participant will complete the study in a single visit which will include the consent process, entry into the study, the study session, and conclusion of the study. The study session is completed on a single day requiring up to 90 minutes.