Hello. Has anyone heard of any reports or stories or studies of E-cig use being bad for you? Any side effects or sicknesses, whether short term or long term?? My dad has been using it for about a few months now, and his throat is painful. He is 64 and has been smokeing for almost 50 yrs. He has been fine up until last week. I've just been always paranoid of this new product. Any information would be greatly appreciated, THanks!!