Vaping makes me cough, smoking does not. It's not a long term symptom, just when I inhale the vapor, I cough. Thought it might be due to nic levels and so tried a 0 nic liquid, still coughed. I'm using a 50-50 mix, so now I need to start experimenting with the mix. Which is more likely to cause coughing, PG or VG? Anyone else experience this and were you able to solve it?