What are the main components of electronic cigarette oil?

Electronic cigarette oil is mainly composed of these four components: glycerol (VG), propylene glycol (PG), spices, and nicotine. Below, we will provide you with a detailed introduction to the functions of these four components:
Glycerol (VG)
Abbreviated as VG, it is a common drug and food additive (commonly used in making desserts such as cakes and chocolates) that has no side effects on the human body. It is colorless and odorless, very hygroscopic, but rather viscous, which slightly increases the difficulty of cleaning the atomizer and reduces the speed of core oil transfer (relatively easy to dry burn/paste). VG can be directly extracted from vegetable oil, coconut oil, and palm oil, heated to high temperature, and then distilled for purification. So the USP food grade vegetable glycerin used in regular electronic cigarette liquids has a purity of 99.7%+0.3% water.
Propylene glycol (PG)
Also known as PG, it is used to dilute the viscosity of VG. Moisture absorbing, slightly sweet, colorless and tasteless, with fluidity similar to water. The US Food and Drug Administration (FDA) describes PG as "generally safe for the human body" (referring only to ingestion) and is a common drug and food additive. PG has good oil conductivity and produces a "small amount of smoke" and a "throat sensation" similar to smoking.
PG has been confirmed by FDA research to be classified as a safe additive (referring only to ingestion), although it is also one of the benchmark materials for antifreeze, commonly used in the field of antifreeze and food and beverage with special requirements. Although PG is generally safe, there are still a small number of people who may experience mild allergic symptoms, such as throat discomfort, phlegm, dizziness, etc. These side effects are relatively brief and mild.
The FDA's statement is actually "Generally Recognized as Safe (GRAS)", which refers to "ingestion". Other methods such as inhalation, injection, or local use are not within the scope of GRAS! Therefore, the safety of aerosols produced by atomizing e-cigarettes with e-liquid is not within the scope of FDA guarantee.
Artificial or natural essence
In addition to tobacco flavors, various natural edible spices can also be used to create complex and varied flavors, such as fruits, desserts, beverages, and other flavors.
nicotine
Nicotine is an addictive substance. Compared to tobacco, the nicotine content in tobacco oil has been proven to be within the safe range for human consumption. Of course, there are also nicotine free tobacco oils available for sale in the market.