You guys should try
salt nicotine instead of freebase nicotine. It really is a whole different game, gives an instant rush just like a cigarette. Freebase to me builds up way too slowly so I tend to take a lot of hits trying to get to the point where I feel something and then suddenly I feel nauseous.
Unfortunately most ready-made juice contains freebase nicotine so what I do instead is get
one-shots and mix my own pg/vg into it (also works out way cheaper), but you could also just get the 0mg juice and add the salt nic into that.
I mix the salt nic at 5mg/ml (roughly equal to 3mg freebase) and couldn't be happier.