I just saw something that contradicts what I have been reading on this thread - that oxidized nicotine has more bite. The following link from Nude Nicotine indicates just the opposite.
The link states in relevant parts that:
"Nicotine concentration is a key indicator of solution integrity –
oxidation of solution can lower active L-nicotine ‘bite’ for a less potent formulation, even at the advertised mg/mL concentration."
And here is the link itself:
"Mini Profile" - Nicotine + Diketones - Nude Nicotine
They also seem to imply that a nicotine solution by itself can contain Diketones - even without added flavorings.
Am I reading this correctly?