What will happen when e-cigarette oil is mixed with alcohol?

Mixing e-cigarette oil with alcohol, whether through inhalation or accidental ingestion, will result in dangerous chemical reactions and pose a serious threat to health. Such behavior not only may cause fatal toxicity but also produce unknown harmful substances.
Producing harmful substances (ketals)
Chemical reaction: The fragrances and solvents (such as propylene glycol PG and vegetable glycerin VG) in e-liquid react with alcohol to form a class of compounds called ketals (Acetals). This reaction occurs even before the e-liquid is heated.
Health Risks: Studies have shown that furan derivatives can activate irritating receptors in the respiratory tract (such as TRPV1 and TRPA1), thereby causing coughing and inflammation. What's more dangerous is that these compounds are more toxic than the substances before the reaction, requiring a lower concentration to cause cell death. Long-term inhalation may cause irreversible damage to the lungs.
2. Physiological effects of inhaling trace amounts of alcohol
Impact and evidence: A specialized research report indicates that even at low concentrations, ethanol can affect the body's balance and coordination abilities, potentially influencing the results of tests such as horizontal nystagmus, walking and turning, and single-leg standing. This suggests that inhaling alcohol vapor does indeed produce minor physiological effects.
3. Life-threatening risk of accidental poisoning
This is the risk that requires the greatest vigilance. Medical reports have documented cases of death resulting from exposure to contaminated e-liquid.
Fatal Case: In a case report published in 2024, a 43-year-old female died after ingesting homemade e-liquid (containing THC and toxic methanol). The autopsy report showed that the concentration of methanol in her body was as high as 235 mg/dL, while the concentration of propylene glycol was 59 mg/dL. Previously, there have been records of deaths caused by ingesting e-liquid contaminated with toxic alcohols such as methanol. This reveals the significant risks associated with homemade e-liquids or the use of products of unknown origin.
Legal Risk: In China, etomidate has been officially classified as a drug. The act of illegally adding etomidate to e-cigarette oil will be regarded as the manufacture and sale of drugs, and criminal responsibility will be pursued accordingly.
In summary, mixing e-cigarette oil with alcohol will produce more toxic unknown compounds. Moreover, the act of inhalation itself can have physiological effects and may lead to fatal consequences from accidental ingestion of toxic substances.