Thanks for your reply

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As far as I'm aware, the vapour consists of a number of molecules (e.g PG, Nicotene, Flavouring) . . . these don't combine into one large molecule and so that means the nicotine is a 'free' molecule and therefore free to be absorbed by any hydrated cell wall. The PG and flavour molecules are much larger molecules and can't be absorbed through cell walls.
So, this still leads me to the conclusion that, not only will the nicotine be absorbed through the cheek cells but, if inhaled, it will also be absorbed by the alveoli in the lungs . . . . . which leads me to question; why do some people say you have to draw and hold in the mouth because that's where the nicotine gets absorbed from e-cigs? when to me, it seems it should be no different from smoking traditional ciggies (where people tend not to hold the smoke in the mouth) and the majority of the nicotine is absorbed through the lining of the lungs.
I just don't get where this (mis)information is coming from (unless someone can point me towards some science-based info).
The reason I ask these questions and seek clarification is primarily related to the phrase often used; 'how to vape' (when I can't see that it should be any different from smoking a ciggie to get the nicotine).