[idDriven]

From EPA "Propylene glycol and dipropylene glycol were first registered in 1950 and 1959, respectively, by the FDA for use in hospitals as air disinfectants. At one point, there were approximately 190 pesticide chemical companies having active propylene or dipropylene glycol registrations." This entire report details safety information, including aerosol use for almost 70 years.

https://archive.epa.gov/pesticides/reregistration/web/pdf/pr...

Another related Glycol saves sick infants from infection and no long-term sequelae reported: https://ajph.aphapublications.org/doi/pdf/10.2105/AJPH.37.11...

Vegetable Glycerin: https://monq.com/science/vegetable-glycerin/

The more research you do on pharmacodynamics and pharmacokinetics the more the 96% less harmful than smoking figure appears likely to be in the correct ballpark for harm-reduction vs smoking. Source: https://pneumonia.biomedcentral.com/articles/10.1186/s41479-...