When working with liquid nicotine, you must take caution! Nicotine can be highly toxic in concentrated form.
Vegetable Glycerin and Propylene Glycol
Vegetable Glycerin(VG) and Propylene Glycol(PG) are the main ingredients that are used as a base for e-liquid. VG is derived from vegetables. It is thicker than PG and is often used as the cloud production aspect of e-liquid.
Propylene glycol (PG) is an almost odorless, colorless, synthetic liquid with a slightly sweet taste. It is thinner than VG and is used in e-liquid as a flavor carrier. PG is classified as a food additive generally recognized as safe by the Food and Drug Administration.