Both make vapor, VG makes a heavier more dense vapor than PG and takes longer to dissipate, VG is also much thicker than PG so is a lot of times thinned with distilled water or grain acohol, or even PG. Usually I find a 60%PG / 40% VG mix makes for a lot of vapor production and still gives proper viscosity.
You can use either one or both together, and you can add flavor to either one.
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May your e-Cig always have one more vape left in it.
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