Big time. Consider: large quantities of the outside world move in and out of your body 12 to 15 times a minute, liters at a time, carrying all the detritus of our daily lives. Think about it the next time you take out the garbage, or walk into a public bathroom, or experience a windy, dusty day.
It's OT, but here is one of the most interesting things I know about the human body: at the level of the alveolus (the tiny air sacs where the work of your lungs is done), there is no mass motion of air. No wind, no breeze, no movement in or out, no motion at all except for the diffusion of molecules along concentration gradients.