I've had my Aspire for about two weeks now. I'm on my 2nd head now because I got that awful burnt rubber taste with the first head after a few days. Now my 2nd head is starting to get it too. I love the draw and the vapor production of my Aspire but I can't figure out where the burnt rubber taste is coming from. Too much chain vaping? It has occurred a couple of times when I first started using it again after leaving it alone for hours. Do I need to take a dry hit first in those situations? I guess I'll clean a 3rd head and get it ready because the burnt rubber taste is awful!