[MonikaT]

Propylene glycol is only slightly more poisonous than water according the the msds. The LD50 for PG is between 18,000mg/Kg to 21,000mg/Kg depending on whether it is a rat or rabbit tested. Water is usually just listed as >90mg/Kg in the msds, but you can find studies that have seen LD50's at arount 25,000mg/Kg for rats.

In other words, LD50 is Lethal Dose 50% of the time. So to be lethal, I would have to take around 20,000mg X my body weight of 84Kg or 1,680,000 mg of propylene glycol at a time to have a 50% chance of lethal side effects. Considering I inhale about 4mg a week, I think I'll be all right.

Propylene glycol is considered to be a food safe additive and is used extensively as a medical inhaler for various drugs, if it was as poisonous as you scare mongers seem to think, I think the FDA would be cracking down on the eCigarette's, but they aren't.

I do know that it is an effective delivery method, I have been taking it this way for a few months and have seen significant progress, although at my current concentration (50% concentrate and 50% 24mg/L nicotine PG) there is too much Ainterol concentrate to hit it often enough to satisfy my nicotine cravings (a typical smoker needs about 3ml of 12-14mg/L PG a day), so I am still smoking regular cigarettes. My next batch I'll cut the concentration of ainterol down so I can hit the nicotine laced pg more often.

I agree that propylene glycol is safe at the levels being used. I've seen PG as a component of artificial vanilla extract as well as on the ingredient list of various baked goods. Many of the fear mongers have likely ingested small amounts throughout their lives without even realizing it.

However, I think your math is off on the LD50 for your body weight. There is the matter of the rate at which each species metabolizes. Someone like Chrishoney probably knows this stuff better than I do, but I remember reading on a different forum on an unrelated topic that, for example, it is necessary to divide the dose for mice by roughly 7 to get the dose for humans. It isn't as simple as a 1-to-1 relationship. Regardless, the LD50 for a human is still many, many more times what anyone could reasonably consume, even if it is likely much smaller than what you have calculated.