I got a Ruyan Jazz classic e-cig as a gift a few days ago. It is gigantic, disposable and probably overpriced, but I really like this thing. It's heavy and feels like I am vaping a awkward metal e-cigar. I haven't figured out the flavor yet. The cartrigde is still going strong and I have been hitting it pretty hard for a few days now.There is lots of vapor with this, but very little to no vapor on the exhale. Anybody have an idea of why that is?