You climb into your vehicle and you expect the air that you breathe to be clean air. You drive down dusty roads and you trust your vehicle to filter out the bad air and only let in the good. It is important for you to routinely change out your cabin air filter so that you will always be breathing good air in your vehicle.
You should set up a schedule for getting your cabin air filter changed out, and you should stick with that schedule no matter how busy life gets.