title_body: COVID-19 screening test using coffee beans
upvoted_answer: Fresh coffee is neither widely available nor inexpensive in all places. Coffee in Japan is relatively expensive because demand is relatively (extremely) low compared to western nations. I think I remember my coworkers also telling me that fresh coffee in India is almost never used because most Indians so drink coffee prefer instant. I wouldn't trust availability of coffee for this kind of test, but it also can't hurt to include it in the app as an option for people who can get fresh coffee.
  I say fresh coffee because instant coffee in my experience doesn't have a strong smell in the first place.
  About smell decay, that depends on a wide range of factors such as time since roasting at time of sale, quality of beans, conditions of storage, and qualities of packaging. My experience with cheap coffees is that they tend to be sold preground (which will lose scents faster than whole bean), though this will not be true in all countries or even all regions within a country.
  Does it even matter though? My interpretation of the &quot;loss of smell&quot; symptom of COVID, having not experienced it myself, is literally a complete loss of smell. It would be far more reliable to advise acquiring a new bag of coffee and seeing if you can smell it.
  Then again, there are loads of more economical options. Basically every spice under the sun (onion powder, garlic powder, curry powder, chili powder, cumin, paprika, oregano, thyme, rosemary, etc.), aromatic vegetables like onions and garlic, vinegar, fish or fish oil, and other aromatic foods might be more widely available at lower prices than coffee in most places.