Snus is what remains after all the tobacco has had most of the nicotine steam-vaped from the plant material. The starting product is a low-grade, low-nicotine, cutting/scrap. The addition of near-zero scrap, is used to offset the variation in nicotine, but helps to keep the tobacco flavor.
What do you do with 100,000,000 lbs of stale tobacco that no-longer has the high-level of nicotine required for smoking, due ot oxidation and nasty stale-taste? You snus it!
It is essentially nicotine-tea, which is made for oral consumption. I am not sure how good it is to inhale, as it is not the "Same", chemicals in the smoked tobacco. (Flavorings and sugars are added for taste, to hide the bitterness of the leaf.)
In any event, you are doing the world a favor by using snus. You are reducing the waste of product, and decreasing processing losses for the companies. (That is part of the reason they can afford to package them in tins, and as packets.)
On the "Nicotine" perspective... I would personally say that this is the safest way to self-extract nicotine for personal consumption. As opposed to leading to a possible OD, while attempting to extract nicotine from full-leaf tobacco.)
Even at 6mg each packet... 5 packets would yield around 30mg potential.
I am not even sure if PG or VG can extract nicotine, but nicotine seems to dissolve into anything, and PG and VG can bond to water... Thus, if the nicotine is in water, inside the leaf, it should come-out with the PG or VG. (Remember, both of those are solvents. They will remove most water-based and oil-based chemicals from the tobacco.)