I've noticed I've been coughing heavily with my evape. I started vaping last week while also smoking cigarettes. Today is my first day without a cigarette. I cough so hard I feel like throwing up, and sometimes there is phlegm. With my last ecig, I coughed for a few days then got over it. This has been going on for a week. But, the new evape is much stronger as I can take in more smoke. The nicotine level is the same. Is this normal?