evidence: You may have stumbled upon a message which suggests that inhaling vapour of camphor, clove, ajwain and eucalyptus oil can help increase oxygen levels. [...] If you are an avid user of social media, then chances are that you may have stumbled upon a viral message which suggests that inhaling the vapour of camphor, clove, ajwain and eucalyptus oil can help increase oxygen levels. The core content of the message says, "Camphor, lavang, ajwain, few drops of eucalyptus oil. Make a potli and keep smelling it throughout the day and night. Helps increase oxygen levels and congestion. This potli is also given to tourists in Ladakh when oxygen levels are low. Many ambulances are now keeping these too. It's a home remedy. Kindly share and help (sic)."