With the extra tank I used the PG/VG base to mix with some refined CO2 oil. I placed the CO2 oil in a shot glass in the oven on 150F for a few (long enough to melt down) then mixed the PG/VG in about 50/50 stirred it and sucked it back up into the syringe then into the tank. It worked good enough on the first run for me to keep experimenting with different mix ratios and oils/ambers. While it doesn't produce as much "smoke" as the ejuice alone (which is my benchmark) it does work.