Thanks.kalimist. this is very common with a lot of folks and could be several reasons. First when you started smoking you would cough, right? Well this could be the same thing and just have to get used to vapor. Also she is inhaling something that may be cleaning her lungs, just thought.
There could also be some kind of issue with PG or VG with her as some folks seem to have problems with one or the other.
I she vaping menthol by chance because this could be a problem.
I did cough for a couple of days when I started vaping but it went away.
I don't know if any of this helps but just thinking and typing on her issue.
WendallB
It wasn't menthol but your point about coughing when first starting smoking makes alot of sense, I dont think I coughed that much when I started smoking probably due to being brought up in a very smokey household but I know most people will cough a fair bit untill they get used to it.
As for the pg vg side of things, I think she's tried a pure pg and a pg vg mix with the same coughing result. The reason I ended up getting myself some vg to mix with my pg was because I would get a slightly sore throat from pg alone, at least thats what I put it down to, and it was the one of the best investments I made, the vg increased vapor production buy 100%, for a while there I could not work out why the vapor was so thin, then I got the go-go and it increased vapor even more.
Its been quite a learning process as far as the mixing is concerned but I also find it to be great when I discover something really simple that can increase the pleasure of vaping.