Is inhaling small oil diffusers safer than vaping?

The argument regarding the use of e-cigarettes and vaping, and if they're safe, is an ongoing issue. But a local holistic physician is pointing to an alternative.
Some doctors say its a healthy alternative

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Compact and Versatile - Our small oil diffuser is designed to be compact and versatile, making it suitable for various spaces and lifestyles.

SALKING Essential Oil Diffuser, 100ml Small Aromatherapy Diffuser with Auto Shut-Off Function, Ultrasonic Diffusers for Essential Oils, Cool Mist