I purchased my e-Go C twist 4-5 days ago and within the 3rd or 4th day I noticed that I started having trouble catching my breathe/not getting enough oxygen. I smoke Marlboro Reds - about 4-5 a day normally, but I've only smoked 1 since I purchased my vape. I surfed for forums for a bit and some members have recommended higher PG and others have recommended higher VG. I'm not sure which direction to take. The eliquid I'm vaping right now is an 18mg product called Cell Block Four by "The Standard" - a creamy citrus flavour. I have about 4-5 sessions where I draw 5 times each. I read on a website where a tester guessed the ratio to be 50/50 or 30/70, but there is no known ratio for it. I've never had trouble catching my breathe before when smoking cigarettes. The first day of vaping seemed just fine. I was chain-vaping and didn't notice it any breathing problems. I also read somewhere on the forums that the tissue in my lungs were coming back to life I thought my breathing may possibly be a reaction to the vapor after a few days of not smoking cigarettes. Some background: I also have a history of Asthma when I was younger. Does anyone have any suggestions or insight into this? Thanks.