Yeah man but that's an insecticide, we're talking talking about e liquids here. Although I imagine (that's actually guaranteed) that if it was widely available someone would try to figure out how to vape itBlack Leaf 40, which isnt made anymore, I dont think, but used to be sold in farm stores as an insecticide for livestock was 40% nicotine sulfate. You did not want to get any of this stuff on your skin.
The main reason why I posted was because when you diy and get % mixed up with mg/ml the consequences might be bad or you might end up having to redo the entire batch. Worst case scenario- giving liquids away to other folks, unaware of what you just made.
Now, I'm pretty sure @KW0017 knows what he's doing and this was just a typo, but me writing a few sentences here won't do any harm and costs me nothing