Not which medications, which device: nebulizers. They routinely use propylene glycol: you're wrong, I'm right. https://pubmed.ncbi.nlm.nih.gov/12425745/ https:

Not which medications, which device: nebulizers. They routinely use propylene glycol: you're wrong, I'm right. https://pubmed.ncbi.nlm.nih.gov/12425745/ https://pubmed.ncbi.nlm.nih.gov/12425745/ Severe asthmatics will be on a nebulizer five or ten minutes at a time, several times a day. Far higher volume than the most committed vaper.