More than 1 year ago, a study was published in the journal Environmental Science and Technology reporting that aldehyde emissions from e-cigarettes are derived from thermal degradation of flavoring compounds rather than the main liquid ingredients (propylene glycol and glycerol). The study found non-detectable levels of aldehydes in unflavored liquids, but up to 10,000-fold higher levels of aldehydes in flavored samples.
You can read the entire article HERE.
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