I would think the process for nicotine extraction would limit WTA by it's specific intent, though I doubt that any extraction system is perfect.
Broad-based extraction as some might practice in their homes or perhaps commercially (I know not what processes may be used commercially) for tobacco flavorings would get some of 'the whole enchilada.' (I don't know why smaller molecules might be excluded).
Mr.Mann, you seem to be supporting the notion that extracted tobacco flavorings may have some WTA, if I am interpreting correctly.
At present I have no position on WTA.
I am not saying that necessarily, but like an at-home pregnancy test, there is no 100% in hardly anything. CYA.
I think it should be pointed out that the term I often use in regards to whether or not WTA is in extracted tobaccos is "negligible." If there is WTA, or more specifically and importantly, the carcinogen TSNA (tobacco specific nitrosamines) in your nicotine, NET, or nic juice in general, then the negligible amounts could be likely on par with the amounts of nicotine in Solanaceae family of vegetables: eggplants, tomatoes, and potatoes.
New England Journal of Medicine "Nicotine Content of Common Vegetables"
Tobacco-specific nitrosamines - Wikipedia, the free encyclopedia
Huffington Post: 20 Pounds of Eggplant Equivalent to One Cigarette
"Pharmaceutical-grade nicotine as supplied by corporations such as Dow and used in regular e-liquid is produced to a very high and checkable standard. It is processed extensively to remove anything other than nicotine. Very small amounts of carcinogens remain, but they are considered insignificant. They are seen in nicotine skin patches made from this pharma-grade nicotine, for example, as well as the e-liquid made from it." Rolygate 10.11.2011 (http://www.e-cigarette-forum.com/forum/general-e-liquid-discussion/230570-wta-e-liquid-issues.html)
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