I got a new Smart-20 mod. It's an iLeaf iStick clone. I also got an Aspire ET tank and I use BVC coils. I prefer the BVCs over the BDCs because the BDCs were spitting ejuice into my mouth. I was getting an awful metallic taste in my mouth with the old Aspire tank I was using and the Smart-20 display stated that the BVC coil was defective. I actually threw up twice last night because of the metal. So I put the Aspire ET (not glass) on and it is far better, however I am still getting a metallic taste and not much flavor. My old eVic was on its last leg and not performing well. I love the nice stable big clouds of vapor. Any thoughts on why the metal? I'm wondering if the Aspire BVC coils are bad. Thanks in advance for your help!