The Electronic Cigar is the culprit that you are inhaling metal. Yes, as you listen. According to an article published by ABC15, there is a study done at the University of California Riverside that states that if you use the Electronic Cigarettes of the brand "Smoking Everywhere" could be consuming metal in its steam. Here are the details reportedly reported by Dr Prue Talbot, author of the study:
During the test, the liquid is heated and converted into a vapor, which is placed inside a centrifuge. The final product: a small metal ball.
There is a bit of stale, most of this material is made of tin, "said Dr. Talbot." There is also some oxygen, some copper and a little bit of nickel . "
The electron microscope revealed the welding used to cover the wires inside the e-cigarette might be the reason.