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The "common cold" virus is also a coronavirus, so that makes sense. That would still help in differentiating if you have the flu or Covid-19. I only heard of getting more sensitive to smells in connection with migraine (totally anecdotal evidence)...

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Rhinovirus is another well known cause for a common cold. A quick search result: webmd [1] gives 10%-40% for rhinovirus, 20% for coronavirus. CDC [2] has rhinovirus as the most common cause, and adds: “ Other viruses that can cause colds include respiratory syncytial virus, human parainfluenza viruses, adenovirus, human coronaviruses, and human metapneumovirus.”

[1] https://www.webmd.com/cold-and-flu/cold-guide/common_cold_ca...

[2] https://www.cdc.gov/features/rhinoviruses/index.html

In fact some "common cold" coronaviruses are really quite similar to SARS-ncov-2.

hcov-NL63's protein spike, for example, binds to the same ACE2 receptor, and is also believed to be a polymorphism of bat and civet coronaviruses. It's also known to cause pneumonia in immunocompromised patients.

But of course, a big difference is that hcov-NL63 has probably been circulating in humans for centuries, so we tend to acquire immunity to it by being exposed as children.

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