we take a deep breath before sneezing because our brain sends singles to our lungs and nerves to take deep breath so when we release air with pressure any dust particles also kick out with that air pressure. read more
This is due to both the deep breath most people take before sneezing and the stimulation of the vagus nerve that occurs during a sneeze. Most people don't even notice any change, and "the effect is minimal," the Times reported. read more