Was getting a slight burnt flavour off of my first coil on my nautilus mini, so decided to change it out with the second one that came in the box. Went to take my first hit off of it and inhaled what I can only describe as the worst toxic taste I've ever had in my mouth, not sure how to describe it but it's sort of metallic, I initially thought it was the battery but have since gone back to the old coil and it works fine. Any ideas?