‘I’ve got this little extra strength’: the rare, intense world of a super smeller

From petrol and perfume to Parkinson's disease, super-smellers can detect scents others are oblivious to. For Krati Garg, the ability's both power and pain

A few years ago Dr Krati Garg, an oral surgeon in Melbourne, was in theatre about to commence work on a patient when she told the anaesthetist she could smell sevoflurane.

Sevoflurane is the anaesthetic gas used to put - and keep - patients asleep during surgery. Ingested via a tube that is placed down the throat, in large quantities its bitter smell can be noticeable, but trace amounts are largely indiscernible.