hi guys. I have such bad stamina and shortness of breath since I started vaping. I have seen a Dr and he gave me a very short, brief examination and said that I was fine. But I am not. I have changed my diy 70/30 vg pg to 75pg/25vg. It has only been just over a day.yesterday I felt much better, but today my chest doesn't feel so great. I never had any kind of coating or thickness on my throat that everybody talks about, just can't have a brisk stroll without breaking into a sweat and I wondered how long before the pg/vg switch has a positive effect? Thanks