First of all, what makes you think this is caused by the incense you're smoking? I don't see why it would take over a week for something like this to start happening. It could be literally anything, and you just assume it's the blend? If it
is the blend, I would be almost willing to
guarantee it has more to do with whatever inert herbs are in the blend rather than any cannabinoids in it.
Second of all, using SWIM or referring to your fictitious chinchilla won't protect you legally, and there's really no need to anyways; nobody's going to bust down your door for admitting you smoked a synthetic cannabinoid blend.
And yes, we all know the Schedule I designation is stupid and that cannabis has many medicinal properties, this is not news. But just because weed is illegal doesn't mean "your chinchilla has to smoke that shit". Either smoke weed anyways, or just don't smoke herbal blends.