In addition to what others have said about breathing it in being the dangerous part, consider the alternatives as well. Either you spray bug killer (which if your cat steps in it and then licks their paws, they would ingest that) or you fumigate the house, which your cats definitely can’t be in.
So while there is a slight danger from breathing it in, the extremely low risk of problems is far better than the high risk of ingestion of toxic bug killers.
That being said, Harris roach tablets seem to be pet safe as well and won’t leave nearly as much of a mess and may even help kill the nest. That may be worth looking into for you over the diatomaceous earth.
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