Re/ vaping:

Removing combustion tar—random volatile organic compounds in aerosol—from inhalation is better, but nicotine is still a cell-function-impeding poison by itself, and it’s going to take time to ascertain what it means to hose your alveoli with vape juice.

Going back to Paracelsus…the poison is in the dosage.

Extrapolating from Paracelsus (para-Paracelsus?)…the poison is also defined by exposure location. Suspension media for vape juice are based on propylene glycol and glycerine, which are generally safe under test conditions, but previously not used as inhalants. Many flavoring agents are essential oils…and essential oils can irritate tissue and cause burns.