Which of the following is NOT an indicator for referring a driver for pulmonary function testing?

A history of asthma is not considered an automatic indicator for referring a driver for pulmonary function testing. While asthma can affect a person's ability to drive safely, a history of asthma alone does not necessarily imply that the driver currently has significant impairment or a risk that would warrant further testing.

On the other hand, symptoms such as wheezing are more acute manifestations of potential respiratory issues that could impair driving ability, making them stronger indicators for referral. Similarly, cigarette smoking is a well-established risk factor for pulmonary diseases, especially in older drivers, increasing the likelihood that they may have or develop respiratory conditions that could impact their driving. Thus, both symptoms of wheezing and a significant smoking history in older drivers are valid indicators for pulmonary function testing, enhancing the safety assessments necessary for drivers who may be at risk for impaired respiratory function.

In summary, while asthma is a relevant medical condition, it does not automatically necessitate referral for testing, setting it apart from the other options presented.