COMMENT: Most of us are fond of pleasant aromas. As I write I have my Christmas candle burning, creating the illusion I'm in a pine forest. Aromas that also top polls of people's favourite smells are vanilla, freshly baked bread, bacon and coffee.
Most of us also have a passing knowledge of aromatherapy - the idea that certain aromas can have therapeutic properties. When we inhale the scents of essential oils from plants and flowers, the theory goes, we feel beneficial psychological or physical effects.
Essential oils are having a bit of a moment on social media. You may have noticed some wellness bloggers and Instagrammers talking about and selling oils, in particular a prominent brand called Doterra, which sells in party-plan, multi-level marketing style.
You may also have noticed recipes featuring essential oils from these same sources. The oils are promoted for use in smoothies or to be added to water; in baking, dressings and savoury dishes as flavourings and for better health.
The use of these oils in food has prompted an investigation - and a warning - from Choice, the consumer advocate organisation in Australia. It recently published an article warning that essential oils can be dangerous when ingested. They quote the NSW Poisons Information Centre, which says essential oils should not be consumed; even in tiny amounts. Doing so can cause seizures, mucosal irritation, nausea, vomiting and burns, it says, and chronic exposure can potentially cause organ damage.