Also, some autos require a bit of a modified inhaling technique. Not a biggie, but does take a bit of getting used to. Er... just wrote about this somewhere else... lemme go look so I don't have to type it again. *searches her old posts*
Okies here ya go:
"Are you using an auto or a manual switch PV? I was using mine like a regular cig at first & it wasn't really seeming to do much...
Then I saw an explanation of "primer puffs" on autos & that made a difference in effectiveness... I'm not sure exactly where I found it. Maybe someone else will remember where that info is."
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But basically, if you're using an auto, it helps to take a tiny puff - not an actual inhale- this is just the... primer.

Anyway, take a tiny puff... that gets the atomizer warm. Then immediately afterward take your normal drag. It takes a bit of getting used to the double drag, but not long. Made a big difference for me when I learned that.
Hope that helps - RR