evidence: Fact Check: Does Inhaling Camphor, Ajwain Increase Your Oxygen Levels? Here’s The Truth There is no study that suggests that clove, ajwain, and eucalyptus oil increase oxygen levels and congestion. New Delhi: If you are an avid user of social media, then chances are that you may have stumbled upon a viral message suggests that inhaling the vapour of camphor, clove, ajwain and eucalyptus oil can help increase the oxygen levels. Not just that, it can also relieve respiratory distress. We suggest you must give it a ‘MISS’.