The ASPCA sent me a couple reference articles on cats and essential oils safety.
Lastly, I spoke with Young Living's Product Support about the subject of cats and essential oils. They stated that:
Please refer to my article on Essential Oils Toxicity for Cats for additional information.
Owner, Restorative Aromatics and NAHA Certified Aromatherapist Level One. This blog focuses on aromatherapy education and other essential oil related topics.