Hey Mike...just an aside, I agree the vapornine turbos are really good. I too had a "couple of duds" at first, or so I thought, until I read a thread where someone suggested taking a straight pin or sewing needle and running it into the carto through the battery-side hole and "carefully wiggling it around a little bit" - being cautious not to break the wire. Also take the soft tip off and straighten out the air-hole tube and poke around the filling a little bit. I did this with my "two duds" and they worked perfectly after that. I have also done that a few times since with cartos that initially are weak in vapor production. It has always worked for me.