Well I have had my VEA for exactly two weeks now with good success. Seem to be doing much better with VG than with PG. My question is What keeps stuff- bacteria, mold, fungus from growing in the smoke juices- they seem to be good media- flavors and all. I am a low user and I have been alternating between 4 flavors for the last 2 weeks. Tonight I decided it was time to REfill my cartomizers. They originally held 1 ml but on refilling, they took less than 0.5 ml each before they started to ooze a bit of juice. That does not seem like a lot after 2 weeks of use. I actually counted my puffs since i am new- and we are talking 100 to 200 puffs per carto before my refillings. So my 45 ml of juices is going to last like forever and I don't want nasty organisms to grow in them.