I have read all the forums and still don't have a solution. I am not new to vaping either. I have an Aspire CF Sub Ohm with a 2000 mah battery running at 4.2V. I bought a 15 ML bottle of Indulge vanilla with 3 MG of nic. Absolutely loved it. I wanted a different flavor with a bigger bottle. So I bought some Vaporfi Pixy Stix and Grape. It's a 30 ML bottle with 6 MG of nic. It has 70% PG/30%VG. But now when I take a bigger pull, it burns my throat and chest, makes me cough, and shortens my breath. I was thinking it was the nic but isn't 6 MG in a 30 ML bottle the same as 3 MG in a 15 ML bottle? It could be the blend but Indulge was the same and it didn't bother me at all. I need some help here.