I have lived in Chicago and Texas before 2001. I did not have any problem with cough when I have lived in those places. I moved from Portland to Salt Lake City in 2001. That’s the time cough has caught me. The cough has become worse in 2002 and I had to see a doctor. The doctor prescribed albuterol and tussigon hydrocodone. They stop dry cough.
An year ago the cough has become worse and I had to go through continuous lungs testing and treatment. The lungs specialist initially said it is a mild copd, but later called mild asthma. I have to use sympycort to escape shortness of breath now.
Utah is a dry place. This is where anyone can be caught by dry cough. Drinking a lot of water and keeping the inside always moisture helps. The humidifier also helps.