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A comment on A Vaping Illness That’s ‘Becoming an Epidemic’. Parent comment
See, e.g., https://www.ncbi.nlm.nih.gov/pubmed/12425745
It's also listed as approved as an inactive ingredient by the FDA, including for inhalation:
PROPYLENE GLYCOL | RESPIRATORY (INHALATION) | LIQUID | 57556 | 6DC9Q167V3 | 10%w/w PROPYLENE GLYCOL | RESPIRATORY (INHALATION) | SOLUTION | 57556 | 6DC9Q167V3 | 25%w/w
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See, e.g., https://www.ncbi.nlm.nih.gov/pubmed/12425745
It's also listed as approved as an inactive ingredient by the FDA, including for inhalation:
Source: https://www.accessdata.fda.gov/scripts/cder/iig/index.cfm?ev..., page 39.