While people who have lost their sense of smell (anosmia) or have a reduced sense of smell (hyposmia) may not be able to detect certain aromas, it is still possible for them to benefit from aromatherapy. This is because the therapeutic effects of essential oils in aromatherapy are not solely reliant on the sense of smell. Essential oils can be absorbed through the skin and mucous membranes and can have physiological effects on the body. For example, lavender essential oil has been shown to have a calming effect on the nervous system, and peppermint essential oil has been shown to have a stimulating effect. These effects can still occur even if the person cannot smell the oils. Here is a link to our article about Aromatherapy. https://toratherapeutics.com/does-it-smell-good/

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It is worth noting, however, that the olfactory system (sense of smell) is strongly connected to the limbic system in the brain, which is responsible for emotions and memory. So, for people who have lost their sense of smell due to trauma or injury, the emotional and memory-related benefits of aromatherapy may be reduced. So, in answer to your question, while the benefits of aromatherapy may be somewhat diminished for someone who cannot smell, they may still be able to experience some physiological effects from essential oils. Speak with your healthcare professional or an Aromatherapist to help you decide the best essential oils and blends to use, and how to optimize the challenge of not being able to smell the aroma.