How much sweetener?

[MrFabius]

Second that.
KAL is the only brand (and the more expensive) that actually works in my morning expresso.
Any other cheaper stevia I try had some funky taste in it.
I guess is valid too for vaping.
Cheers

I have but since I've been using it in hot tea for years I long ago acquired a taste for it. I use the KAL brand. Pure powder in my tea and pure liquid in my juice. It does have somewhat of an aftertaste, but I'm used to it. I'd start with about 1 drop per 5ml and slowly increase (if so desired).