Take smaller drags, drink water and have patience. It is like when you first started smoking takes some getting used to. The VG or VG mix will make a difference. When the GF started the PG was very hard on her but we switched to a 50/50 and all is OK.
Our latest is jokesmoke for her and black coffee for me. Jugheads made it 50/50 and she can handle it. I didn't like the coffee for about 2 hits then it grew on me. It is almost addictive right now. There are a lot of great dealers in Canada and if you get a juice you don't like, leave it alone for awhile and let it steep. The flavor changes. If that doesn't work you can mix it with something else or sell it or check the Pay It Forward. Something like the movie but we don't stab anyone at the end.
Drac