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when people refer to cedar as a dangerous aromatic, they're referring to the intensity and effect of the oils, not the fact that they exist at all, that's true. any plant with an associated aroma could be considered an aromatic. the more aroma, the more the concentration of the plant's essential oils and essential oils should always be used with caution, whether it's something fairly harmless like lavender or something quite dangeous like pennyroyal. when it comes to high intensity EOs like cedar and eucalyptus, you have to exercise caution on two fronts: handling and inhalation.
the goal of litter should not be to outstink the stink! if your litter has that much essential aroma, don't use it!
i would not use eucalyptus as a bedding, personally. any tree that can be smelled whole and intact in the air has a healthy dose of EO. also, it's not a great idea to equate medicinal benefits with harmlessness. eucalyptus is a useful natural tool for the respiratory tract, but it has no preventative benefits and shouldn't be used constantly, either by you or your hens. that's like saying that morphine is a useful painkiller, so you should take it daily for routine aches and pains or to prevent such.