Ok, I'm putting a tentative toe in clearomizer ocean....started out very slow w/an X2 clearo from SI, and I'm trying it out on my 78mm auto batteries (yes, it looks a little goofy, but it's fine for home use). I'm getting great flavor & vapor, but I'm also getting some weird popping sounds (the first one kind of scared me!
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Is this normal or am I doing something wrong?

Is this normal or am I doing something wrong?