I Feel very strongley that this is the reason I am having SOB along with others(heavy lungs), Ive never smoked cigs just chewed.vaped for 2 months and now SOB? I think what needs to hapen is have flavor atatchments that are not vaporized but something near the opening(mouth piece) that gives some flavor...................We need to look into these flavors carefully.IMO..........not everyone is or will have SOB while using E Cigs and they are lucky cause I have ejoyed vaping but for us having reactions be carefull.....we are all guinea pigs on this adventure...........Im done vaping until I get my lungs back