I forgot my 510-t at home one day, on my way to work. Luckily, I had my e-cig supply box with me. So, I busted out a new 510-t atty, filled up a tank, and slapped on a charged battery. Right away, I noticed the draw was harder, and the amount of vape, was a lot less. When I went home that day, I decided to try to throw the tank I was using at work, on my 510-t that I had at home, and the vapor production was great. I even reversed it, and threw the tank from my good performing 510, onto to the not so good 510, and once again the not so good 510 disappointed me. Could this be due to a bad atty? I can't think of any other reason, since they are both identical set-ups.