Animal Experiments Show E-Liquid Is Harmless to the Human Body

The main components of e-liquid in electronic cigarettes are glycerin and propylene glycol. To test the impact on human health, scientists placed gorillas and white mice in high concentrations of vapor for 12 to 18 months, and prepared an equal number of reference comparison samples. The same method was used to test the effects of direct ingestion of glycerin and propylene glycol on human health, with the dosage in the ingestion experiment being 50 to 700 times the amount of glycerin and propylene glycol that animals inhaled.

In terms of developmental speed, blood cell counts, urine tests, kidney function tests, and fertility indicators, the test group and the control group showed no essential differences; the only difference was that the white mice consistently showed higher body weight in propylene glycol vapor. After being exposed to high-saturation vapor of glycerin for several months, the gorillas showed some dryness in their facial skin. However, this condition disappeared when the vapor concentration was reduced below saturation.

Autopsies also found no differences between the experimental group animals and the control group animals, and lung examinations showed no overall or local irritation from glycerin and propylene glycol vapor on the animals' lungs. The examinations of the kidneys, liver, spleen, and bone marrow of the experimental group animals also showed normal results.

The results of this experiment, along with the fact that there have been no human cases of disease caused by exposure to glycerin and propylene glycol vapor, prove that long-term exposure to saturated vapor of glycerin and propylene glycol is harmless.