Vegetable glycerine (glycerol) - safety discussion

[Casey C]

Originally Posted by markarich159

These are different physical processes at work. Vaporization is different from Boiling(evaporation). One is a physical phase change(requiring a specific enthalpy). The other is a radical change in particle size. In an atomizer (as well as a fog machine) the glycerin or PG assists the water present to vaporize(this is not steam(gas), rather a mixture of PG/VG/water that has been tranformed from a liquid to a very small particulate vapor- particle size of about 0.04micron). The nicotine(and any other flavors/excipients present in the initial liquid) are taken "along for the ride", so to speak, dissolved within the microparticles. This is why it takes less energy to create vapor then it does steam , and also why the atomizer can function at lower temperatures. This property of glycerine/PG/water solutions has been known for some time. It is a similar principle used in a nebulizer machine(that delivers albuterol/cromolyn/ipratropium solutions to asthmatics). I went to Pharmacy School for 6 years to learn about things such as this. I'm sorry, I did not mean to offend you. I just don't want information that is patently false distributed on these forums to cause hysteria among us fellow vapers. We already have enough to worry about with the FDA, PayPal etc... Ok that's my final word.

oh and one more smug response, you find me an e-cig that nebulizes, then vaporizes, therefore atomizing, and I will buy it from you

[edlogic]

i have been trying different mixtures of pg and vg and nic juice and at first i was having lots of trouble figuring out why i was able to vape a lot when i first got my ecigs but then i started having panic attacks - sometimes extreme episodes

now i am thinking that it may be temperature related - it seems that when i puff fast enough to keep the vapor relatively cool that i am having no trouble - but if i puff slow and the vapor gets warm - that is when i get the symptoms - and it only takes a minute or two for the symptoms to occur

my first 901 atomizer would heat up the juice more and the vapor was harsher tasting - but it went out and the second atomizer is cooler and smoother

my 510 gets juice built up in the bottom and it doesn't vape well unless i puff really slow and then the vapor gets hotter

i blew out the atomizer and got all the extra juice out of it so that now when i puff it doesn't get as hot and i get good vapor

bottom line - i could not find any correlation to the juice mixes and the panic attacks

but i am starting to think that there is a correlation to temperature of the vapor / atomizing

[MissVapor]

Originally Posted by Casey C

since post count will allow me to eventually link things I'll keep going,

I'm not interested in the lethal dosage of acrolein, I pointed out that the amounts produced would be small, its long term exposure to a tissue irritant that produces effects at 2ppm that I'm worried about. Throat irritation, respiratory problems, secondary infections, although cancer is ruled out by it not being a carcinogen, it is something you'll be sucking into your lungs repeatedly and regularly

I might have to agree somewhat here...I tried using VG for about a month..the first few weeks I was fine..I had a little bit of sneezing, but it eventually turned into a full blown sinus infection/stuffy nose that took 5 days to clear up after qutiting VG all together...When I would blow my nose, it was the consistency of glue almost, very sticky and green.. I can only imagine what was building up in my lung tissue..

[Sun Vaporer]

Originally Posted by Casey C

since i can't link the article I'll post excerpts

"The Effect of the Humectants Glycerol and Propylene Glycol on Mainstream and Sidestream Smoke Deliveries of Acrolein, Formaldehyde, Acetaldehyde, Acetone and Propionaldehyde"



"It was found that glycerol, added at a level of 3% to the filler, contributed about 8.5% of the total mainstream smoke (MS) acrolein. A more recent investigiation (2) showed that after spiking cigarettes with glycerol, a small increase in MS acroleim delivery was noted, however a significant increase in sidestream smoke (SS) delivery was found. In order to confirm these findings a more extensive project was commissioned. "


"For MS the addition of glycerol and/or propylene glycol to the filler had no significant effect on the acrolein delivery. In fact, acrolein deliveries at high humectant content, ( 5%) were lower than for the reference cigarette. This is probably due to a lower weight of tobacco in the filler. For SS the addition of glycerol to the filler had a significant effect on the acrolein delivery e.g. 5.4% glycerol gave a 50% increase in acrolein delivery. The acrolein does not appear in the MS smoke in significant quantities perhaps due to-filtration by the filler rod or the filter itself. Approximately 1% of the available glycerol was converted to acrolein during smoking. Propylene glycol had no effect on SS delivery of acrolein. The cigarettes containing both humectants also showed increased acrolein deliveries which were directly proportional to the glycerol content of the filler."

from what I'm reading, propylene glycol appears much safer, the OP was quite correct

Casey C----the evidence based on acutal studies concludes that there is no acrolein production and that VG is no more or less safer the PG. Until more tests are done to prove otherwise, there is no point in stating speculation. This debate about VG v. PG has been going on here for a long time and since then numerous Suppiers and manufactures have done studies and have not found acrolein.

Bottom line is if you do not feel comfortable using VG--then do not use it. But please refrain from rank speculation to people who have been looking at this issue for a long long time here.

Thanks,

Sun