Pivot Breath Sensor Performance Study

The objectives of this performance study are to: * Non-invasively measure carbon monoxide (CO) levels in the exhaled breath of study subjects using two different types of measurement devices. * We will assess the correlation between the measured CO levels (in parts per million, or ppm) of the study CO breath sensor (Carrot Inc.) and a similar device. * assess user documentation comprehension * obtain feedback on the Pivot Breath Sensor via rating scales.