Essential oil diffusers are used to vaporize oils, releasing small amounts into the air. The same safety concerns regarding inhaling essential oils also apply to using oils in a diffuser. Keep diffusers away from open flames and heat. Because of allergies and sensitivities to odors, individuals diffusing essential oils should seek permission from their roommates and neighbors before doing so.
As with any electrical appliance, be sure to avoid overloading outlets and diffusers should be unplugged when not in use.