Now this is as usual for my wife Zumix like POD system, straight forward.
My wife is one of those rare cases sensitive to freebase, so I had to use salts, I bought those as 20mg salts (Thanks TPD) in a 50/50 base.
I neede 10mg (mimicking a 5% freebase) when tested still she didn't feel the throat hit or nicotine, and neither did I really, so I added 2% freebase to the salts (She smokes nearly 2 packs a day..) boosted the PG and finally got the throat hit.
It's a simple recipe, but effective and works on one of those flavourless pods.

Try it you won't be disappointed and might help your friend to stop smoking