07/23/2025
According to the American Lung Association, propylene glycol and vegetable glycerin "are the primary carriers of ni****ne and flavorings in e-liquids. Though they are common additives in food and believed to be safe for ingestion, they are also used to make things like antifreeze, paint solvents and artificial smoke in fog machines which are dangerous when inhaled. When heated, propylene glycol and vegetable glycerin break down into formaldehyde and acetaldehyde—both carcinogens. Inhaling these chemicals over time may cause inflammation of the airways and damage to lung tissue, which in turn can lead to chronic respiratory diseases."