I have been smoking a vapor pen and lately my throat has been feeling irritated. plus i have noticed my lungs are itchy only when i smoke the vapor pen. my ears are itchy as well. i am coughing a little mucus up, not much but some every so often.

Stop vaping: There is very little, if any, regulations or oversight for the ingredients/chemicals being used in electronic cigarette devices. These devices have not been around long enough to determine the potential harms associated with their use. It sounds like you are having a negative reaction to one or more of the components of the vapor, perhaps even an allergy. I recommend that you stop vaping.