What action should a driver take to prevent smoking while driving?

To prevent smoking while driving, the most effective action is to avoid smoking altogether. This choice directly eliminates the source of smoke, ensuring that it does not occur in the vehicle. Smoking can lead to poor air quality inside the vehicle, which can be especially problematic when transporting students, as it may lead to health issues and discomfort.

Opening the windows may provide some ventilation but does not address the root cause of smoking. Avoiding passengers addresses a different concern, as limiting passenger presence does not impact the act of smoking itself. Keeping the engine well-maintained is important for overall vehicle operation and safety, but it is unrelated to smoking behavior. Therefore, choosing not to smoke while driving is the most effective way to prevent it entirely.