So now we are going to show how an simple and inexpensive scientific alteration of nicotine renders it into a state that both keeps it nicotine yet makes it "underivable" from tobacco (much like Schrodinger's cat which is both alive and dead at the same time: http://invigorate.royalsociety.org/ks5/the-best-things-come-in-small-packages/why-is-quantum-physics-important.aspx).
All compounds in plants outside of the photosynthesis process are molecules or atoms, e.g., water, sugar, and so on.
Note that here we rely on the scientific principles used in quantum mechanics (https://en.wikipedia.org/wiki/Particle_statistics#Quantum_statistics) that state all atoms and molecules are indistinguishable.
To deny this is to deny physics, quantum mechanics, mathematics and science in general.
EDIT: While one can, I suppose, argue that their might be "other tobacco things" somehow left in "nicotine" as impurities one must also understand that typical "USP" nicotine is specifically identified as suitable for, among other things, medical and food applications (see: http://www.usp.org/reference-standards). What's interesting here is that TFN is also identified as "USP" grade (see patent above re: "synthesis of pharmaceutically pure, USP grade, (R,S) Nicotine").
Somehow the FDA engages in magical think relating to the purity of nicotine. Quite a bit is available on the purity of chemicals in general. "USP" is medical grade and very, very low in "impurities." Also, it's important to note, no chemical compound is free of impurities, even the highest grade (which has the lowest number of impurities as opposed to none).
To believe the FDA is to not believe in science.
Everything used by humans contains a certain amount of impurities and to create a special category just of "tobacco products," i.e., exceeding USP just because it's tobacco, goes against all of science.
(Imagine, for example, if lawyers began suing based on the fact that USP is not "pure.")