Here's one that'll perk up some interest from some of you.
Into a 40 mL sample vial, I've added 0.5 mL water, 9.5 mL of PG, and 5 pillows of Camel Mellow Snus.
I don't have anything approaching a precision scale available here at home, so as best I can guess, each pillow contains around 0.7 grams of material (when you've been at it as long as I have, you can look at stuff and say, "Yea, that's 7/10th's of a gram or so...), and probably around 5 mg of nicotine. If I get it all out, this would give me 35 mg of nicotine in 10 mL of liquid (or however much I can squeeze out).
So the first thing you can see, is that 35 mg/10 mL, is only 3.5 mg/mL. That's the most I can get.
The first thing I'm thinking is this, "I dunno if I want this stuff in my atomizer".
The second thing I'm thinking is, "3.5 mg/mL isn't too strong for an e-liquid"
The third thing I'm thinking is, "This stuffs gonna be too dark to titrate, and 3.5 mg/mL isn't too hot anyway, and that's if I can get it all out".
The fourth thing I'm thinking is, "This stuff wouldn't be too bad under my lip while vaping zero mg liquid".
The last thing I'm thinking is, "Snus as an easy alternate nicotine source for e-liquid doesn't cut it".
Edit: It looks like I may have gotten a couple mg of nicotine out of each pillow, the total mg are so low, and the solution was so dark that the titration was really an exercise in stupidity.