That powdery pattern in the top image looks like mold, and I'd toss it. Plume, which I've been given to understand is mineral residue that gradually transitions to the surface over time looks more like strata or veins in the tobacco. However, you describe the deposit as sparkling, which is more typical of plume than of mold. Then again, it's tinned by C&D, so mold is a higher probability.
I dunno, but I don't like the looks of it. Personally I'd toss it. When in doubt, throw it out.
But, they're your lungs to damage, not mine, so your choice.