This phantom smell can sometimes happen after a viral respiratory infection, sinus inflammation, or occasionally as a reaction to medications like your AZ-1 (azithromycin), Xyzal (levocetirizine), Unicontin (theophylline), or Alex cough syrup. Because your cough has lasted nearly three weeks despite these treatments, it is very important to consult your doctor for a follow-up. They can listen to your lungs, review your medications safely.
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What should I do if I have had a cough for 20 days and keep smelling smoke while taking Alex cough syrup, AZ-1, Xyzal, and Unicontin?