And I am still wondering what that "something" is that could happen to me. No, really, in fifty years of reloading, I have never had a hankering to ingest gunpowder. Not even once. I really try not to contaminate my powder by handling it, in the true sense of "Handling." As in, I keep my gooey fingers off it, and pour powder through funnels, measures and tricklers, and do not "trickle" powder by trying to squeeze a few grains out between my fingers! Can't imagine inhaling deeply and forcefully enough to actually vacuum powder back up off a scale pan or out of an open case. If I ever do, I expect my asthma will have me coughing so hard I won't absorb much dissolved nitro or graphite! I don't bath in it, nor plunge my arms into it, I just mechanically transfer it from can to measure to either scale pan or case, depending, and then I go shoot it!!
I do realize that if I had a heart condition -I don't - and if I suddenly stopped using a nitroglycerin based powder, I could run the risk of SCA, as did a whole bunch of Norma's employees when they closed down a factory with a whole bunch of old guy employees. So I will keep on using powder and keep on reloading.
In the meantime, instead of trying to conjure some non-existent danger from being in the same room as an open can of powder, I will refrain from smoking while reloading, and I will bloody well read the label, the manual, the scale setting, and cross-check twice before I load a case. Inadvertent booboos in handloading come from mistaking one powder for another, or mis-adjusting the case. Advertent booboos come from ignoring book maximums, in pursuit of meaningless boasts.