It's probably the juice. I've noticed that quite a bit, whenever the vapor is not as "vaporish", more like a mist - larger droplets, I suppose. I was getting that from a Stardust and have gotten it from the vivi nova, a drip atomizer and ego tanks, as well. Not all the time, though. I'm thinking the atty is overwhelmed by too much juice or something. When it's not happening, the vapor is smooth and soft as velvet.