Hi Chicken Lady! Yes, you are right... but, if you had done the same thing with flour, you would have had the same result - neither would we wave the vacuum cleaner bag around. We'd all be hacking! DE is a fine powder, and no, we should not "breathe it in". So for the sake of newbies or veterans out there, if you decide to dust your coop, run, etc., do so while the flock is in a different area. And if you provide a dust bath for them, mix the DE in with some sand or good 'ole dirt. Same effect and they won't be dusting the place up so much! Food Grade DE is a great organic tool to have in your arsenal - but anything can be used improperly. Happy Dusting!