Wikipedia quote.
Polyethylene glycol has a low toxicity and is used in a variety of products.[6] It is the basis of a number of laxatives (e.g., macrogol-containing products such as Movicol and polyethylene glycol 3350, or SoftLax, MiraLAX or GlycoLax). It is the basis of many skin creams, as cetomacrogol, and sexual lubricants, frequently combined with glycerin. Whole bowel irrigation (polyethylene glycol with added electrolytes) is used for bowel preparation before surgery or colonoscopy and drug overdoses. It is sold under the brand names GoLYTELY, NuLytely, GlycoLax, Fortrans, TriLyte, Colyte, Halflytely, MiraLAX, Softlax, ClearLax and MoviPrep. When attached to various protein medications, polyethylene glycol allows a slowed clearance of the carried protein from the blood. This makes for a longer-acting medicinal effect and reduces toxicity, and it allows longer dosing intervals. Examples include PEG-interferon alpha, which is used to treat hepatitis C, and PEG-filgrastim (Neulasta), which is used to treat neutropenia. It has been shown that polyethylene glycol can improve healing of spinal injuries in dogs.[7] One of the earlier findings that polyethylene glycol can aid in nerve repair came from the University of Texas (Krause and Bittner).[8] Polyethylene glycol is commonly used to fuse B-cells with myeloma cells in monoclonal antibody production. PEG has recently been proved to give better results in constipation patients than tegaserod.[9]
Doesn't really apply to vaping except that it's non-toxic ... but I found it entertaining. But then, I'm a little warped.