Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Ozone alert!!!

I bought this for additional protection during flu season. It sounded like a good product and most of the reviews were positive but after only three (3!!!) days (average about 3-4 hours use each day)the blue light stopped working. More importantly, I developed a headache and a wheezy feeling in my chest and throat after the FIRST day! After the light stopped working I decided to do a little research on ion air purifiers and I am pretty certain this little gadget was the cause of my discomfort. I don't have asthma, but this article from the Mayo Clinic (and other online articles about air "purifiers") helped inform my decision to return this puppy and look for another solution to combat the flu and other unwanted airborne germs. [...]Long story short, if you enjoy sucking ozone into your lungs and the respiratory distress that causes, then this may be the product you were looking for. Otherwise, I recommend DO NOT WASTE YOUR TIME OR MONEY!!