I buy Heritage
VG at Whole Foods. It is a purely vegetable-based glycerin. Works great but it is very thick, and I generally cut it with a few drops of vodka. You can also use distilled water to thin it. I am primarily using a 510 system, but I have a Green Smoke too. I believe their carts are
PG-only for the vehicle, so not from animals. I am not a fan of
PG, due to negative reactions to it, and I've tried
VG in their carts. For the regular batts, it is fine, because it is 3.7 V. But I also have the GS passthrough (they call it USB electronic cigarette, I think). That monster MUST run at 5V, direct from the USB. Unmodified GS carts work great on it, MASSIVE vapor. But add
VG and vape on the GS
PT, and things go bad fast! Acrid cough-producing harsh vapor. I think maybe the 5V cooks the
VG into acrolein, as this is a reaction product of
VG under very high heat, which is not possible with regular 3.7V. Regardless, for whatever reason, and I've done the experiment several times,
VG in the GS
PT is a no-go. I've hurled a few otherwise good GS carts into the trash, as the vapor was that bad, and it was clear the cart would never give good vapor again. Not tried
VG in GS carts on the GS batts yet. My guess is they will be fine at 3.7 V, but I'll try it at some point and report. It would be great to be able to avoid
PG and reuse GS carts. GS is expensive, maybe too much so, but it is a quality product, very convenient and well built. The
PT is about 3x as expensive as my 510
PT, but is a raging beast of vapor in comparison.
I've been asking around in several threads if others have problems with vaping thick
VG-based juices at 5V, but so far no one has responded, so I guess
PG is the juice of choice with high voltage.
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