I've been vaping for around 2 months now and recently started to feel heavyness in my chest, like suffocating. Why does it happen and how to stop it? I'm using m65 with first atlantis, 50/50 Avoria base and t juice flavourings. It usually Happens after 3-4 hits which I don't think is much. It started after I started lung hiting, maybe it's the cause.