I had a problem in the past with a SMOK tank when I bought a TFVB and it leaked right out of the box. I made the mistake of purchasing a SMOK tank again and it, actually they as I bought 2 of them, leak a huge amount of juice out of the air holes. I am not talking about a little leak. If the tank is left sitting there all the juice will run out of it. I have everything tight, I replaced the O ring. There has to be a way to make these useable because currently they are not.