Some also do have specific use cases where they work really well, like Tea Tree Oil for acne and nail fungus or Peppermint oil for nausea. Most of them don't do anything though.
I think it's straight up a me thing, I find most perfume overpowering etc,
Have def been around all forms of oil diffusers etc, always to the same result, I wish I enjoyed them, everyone seems to like them so much.
They are just allergic reactions waiting to happen.
Tea tree oil was the only one I think to actually have merit, but I imagine we've been able to reproduce the beneficial part of in a lab. (with minimal risk of triggering allergies)
Essential oils were invented in the East. As an Indian, I can tell you we use them as scent by rubbing it usually near the ear/neck. Today I got to know these weird western women mix it in foods and eat it.
There's an entire industry of pedaling them as health products. I once had a random bint on a tour notice my sore back thanks to my scoliosis and asked me about it during some downtime in the tour. After the tour was done she "tipped" me by pouring an amount of essential oil on my palm, told me to rub it on my back, and that if I buy the stuff myself it'll cure my scoliosis.
I walked to the break room and washed it down the drain. Shit made my hand STANK and my head hurt from the fumes.