Quick update: I just got some glycerin and PTB last night and it's the best thing I've done since buying the 510. I'm producing about 1/3 more vapor (that includes it being thicker) and with the tea bags I don't have to refill my carts nearly as much. I only have one gripe: I've lost some flavor with glycerin mix. I did dillute it a bit with water and have a close 50/50 mix. I guess this will change when I start mixing my own flavoring with unflavored juice but til then no real complaints.