Results of lab studies are promising — one at Johns Hopkins found that certain essential oils could kill a type of Lyme bacteria better than antibiotics — but results in human clinical trials are mixed. Some studies indicate that there's a benefit to using essential oils while others show no improvement in symptoms.

Inhaling essential oils directly or in high concentrations can trigger symptoms in the damaged lung tissues. Individuals with asthma or COPD should consult their healthcare professional before using essential oils and together assess any potential risks and benefits.

At an aromatherapy session, the practitioner will ask about your medical history and symptoms, as well any scents you may like. You may be directed to breathe in essential oils directly from a piece of cloth or indirectly through steam inhalations, vaporizers, or sprays.

Aside from their scents, essential oils are each known for their own unique properties. If you're wondering what oils to diffuse for sleep – those such as lavender, cedarwood and jasmine – are considered to have soothing qualities that make them particularly useful as an all-natural remedy for improving overall sleep.