I have a Riva 510 and have been using Boge 510 cartos that I got from CCV. Twice now, I've gotten a new carto out, dripped some liquid into it, screwed it on and gotten smoke. I took off the drip tip and pressed the battery button, and smoke comes out of the end of the carto. It was the opposite of fun when I first inhaled it. I'm pretty sure I did something wrong, because cartos from the same pack work fine, and CCV has a reputation for selling good products. Any ideas?