With corona it might be a good idea to differentiate between an expectorant given in a pill or liquid form that in turn causes the expectorant effect VERSUS inhaling something foreign that coats the lungs and in turn causes the expectorant effect. The oral form may or may not be beneficial but ..... with the inhaled form you'd be coating your lungs, over and over, with the same material found building up in a vape or coating a bag at the same time that your lungs are incapable of working the way they should. Without corona your lungs have a chance of cleaning up the residual from vaporizing. With corona your short of breath because your lungs aren't functioning properly and may not be able to clear the lungs. Sounds like "insult to injury".