To give you a better understanding of how this research would have been performed today, here would be the last two paragraphs that would replace the last one from 50 some years ago.
"The results of these experiments in conjunction with the absence of any observed ill effects in patients exposed to both triethylene glycol and propylene glycol vapors for months at a time, provide assurance that air containing these vapors in amounts up to the saturation point is completely harmless. However, the results of the study may be deceiving because flavoring, such as those used in electronic cigarettes to market the products to children were not tested. In addition, due to the inhalation method required to deliver propylene glycol laden with deadly nicotine by atomizer, inhalation will need to be deeper and thus may cause serious negative effects
We avidly caution that there may be serious consequence in any use of propylene glycol in any of the drug delivery devices and extensive testing should be completed before any conclusions are reached based on this study."
LOL. Hilarious! Very well done!
