vaping can easily cause you chest pains. inhaling anything other than regular air is foreign and your body doesn't react well to it. wheezing chest tightness short of breathe and even chest pain. only way to really find out if its the vaping is to stop and see if it resolves. I'm pretty sure the juice mix doesn't make a difference assuming your are using a safe grade mix and not some clandestine rogue garage juice maker(no offense to the people that mix at home and actually research and use the proper products). pretty sure your doc will agree. In all seriousness though if you were seen standard would be ekg, blood labs, cxr. if inconclusive then he should be sending you for a stress test and monitoring your blood pressures. anything from a heart attack (AMI) to an aortic aneurysm, to even gall stones can cause you chest pain.