Hi sisco ye and other members reading this post! From what I've heard and read, a lot of these "vape pens" are manufactured by tobacco companies. Personally I avoided any imitation cigarette devices and companies with "Lites" in their name, and recommend others to avoid them too. I would advise you to speak with your doctor about this to be on the safe side. Also I would recommend doing some research on the device you purchased for information about the company and to see if any other users have experienced the same or similar issues that you have experienced. I do hope this is a one off problem and you recover! And remember around one month of using E-Cigs you may experience: wheezing, coughing up mucas, nose bleeds, and in some cases temporary acne can occur. These are signs of your body removing all the toxins from years of tobacco smoking, and last around a month maybe two, but after three months of no cigarettes you will notice a difference! Best of luck!