WOW! Thanks for that info. I was never clear on whether that was for one Marlboro or a whole pack.
A nanogram is one billionth of a gram. One cigarette is approximately 1 gram of tobacco, and a one milliliter cartridge of e-liquid is also about 1 gram. E-liquid potency is usually referred to in terms of milligrams (one thousandth of a gram) per milliliter. That's why I think it is better to refer to e-liquid strength in terms of a percentage. 16mg/ml = 1.6%
Approximately 2 drops (.1ml) of eliquid lasts me about as long as an analog would. Assuming all of the .1ml of e-liquid is converted into vapor (and anyone who's used an e-cig knows that not all the eliquid is used--lol), that means I'm getting less than 1.6mg of nicotine and about .8ng TSNA. Compared to the 11,190 nanograms of TSNA in a one gram Marlboro cigarette that is 1:13,987.5 ratio....and, as you point out in your masterful letter, that doesn't even count all of the
most deadly components of cigarette smoke that aren't in e-cig vapor at all.
Taking it even further, when you consider that the aforementioned tenth of a milliliter (2 drops) creates roughly 10 liters of vapor, that means the vapor we inhale is probably no more than .001% e-liquid--
the other 99.999% is air. With that in mind, it is no wonder that the
FDA did not detect any DEG or TSNA in the vapor itself.