The respiratory effects of second hand smoke, if any, are present only when unrealistic concentrations are present. In this theoretical environment, the absence of oxygen would also create respiratory effects.

The dicrease of pulmonary function cannot be narrowed to exposure to ETS, unless the person is forced to exist exclusively in a smoking environment, isolated from all other concomitant factors, such as vehicular atmospheric pollution. This scenario cannot be achieved in real life, consequently the above statement cannot stand. For more information about the pollutants from vehicular emissions, click here.

For more information about smoking and asthma, click here