When people vape liquids containing propylene glycol or glycerol, the heat turns them into harmful chemicals like formaldehyde and acrolein, which can irritate the lungs, damage blood vessels, and mess with the body’s internal clock.

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Against

Evidence from Studies

Supporting (1)

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A Review of the Toxicity of Ingredients in e-Cigarettes, Including Those Ingredients Having the FDA’s “Generally Recognized as Safe (GRAS)” Regulatory Status for Use in Food

Narrative Review

2024 Oct 22

Contradicting (0)

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No contradicting evidence found

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According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

A Review of the Toxicity of Ingredients in e-Cigarettes, Including Those Ingredients Having the FDA’s “Generally Recognized as Safe (GRAS)” Regulatory Status for Use in Food

Score: 1

DOI: 10.1093/ntr/ntae123

Similar Assertions

When people vape, the liquid in e-cigarettes heats up and turns into a mist, but this process can create harmful chemicals like formaldehyde and acrolein—things that can hurt your lungs—even though these same liquids are considered safe to eat.

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