How about this: Keeping aerosolized silicates out of orifices is the best policy.
There are a lot of things that you don't want to inhale that are relatively inert otherwise. A tiny amount of Plutonium-239 in your lungs will kill you deader than someone who intended to testify against Hillary. Don't inhale it? Not nearly so bad. Your skin is enough to defeat the alpha emission. Just don't freakin' inhale it.