I don't think they have primer like the attys do but when you blow them out before using that would probably get rid of much of anything nasty. It just sounds like the juice is gradually getting to where it needs to be for a better vape or the coils need to be good and wet, maybe let the carto sit for a half hour after the spin before vaping it? I used to do that but am getting too impatient lately.I was just wondering. I'm at work, so I couldn't toss the carto and had no choice but to vape it. Could the cartos have primer on the coil? It's gradually getting better. Hmmmmmmm
