Canada

This is the best summary I could come up with:

In 2021, a survey in the journal Brain Sciences found that people consistently ranked smell below vision and hearing — and even below commercial products.

In recent decades, we've gained a greater understanding of just how much humans rely on the sense of smell — for everything from social communication to the detection of environmental hazards.

It's a sensitivity that would have made evolutionary sense for our foraging ancestors as they sought food, helping them to discern the smell of overripe fruit.

In 2015 a study from Israel's Weizmann Institute of Science found that after a handshake, people consistently brought their own hand to their nose — subconsciously smelling each other.

While the loss of smell emerged as a possible symptom of COVID-19 as early as March 2020, it took months for governments to add it to their screening guidelines for the virus — even after researchers flagged it as one of the most accurate indicators of infection.

A recent study published in the academic journal Life suggests that at least seven per cent of those who lost their sense of smell to COVID-19 have never fully recovered it.

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