This is really weird. I am in my third week of having a nagging cough and minor cold symptoms. It is rare for me to get sick like this, other than sinus headaches. There might be some new super virus going around. A physician's assistant told me it appears to be bronchitis, and she prescribed some drugs to treat the symptoms and help me sleep. They have provided quite a bit of relief today. This vaporizer is helping a little bit, too.