Does Smoking E-cigarettes Cause Breathlessness And Pain In The Chest And Neck?

My boss smokes an e-cigarette in his office and my office is connected to his so the vapors travel into my office and the windows don t open so there s no ventilation other than the door in and out of the office. A month and a half ago I started to have symptoms of shortness of breath, pain in my chest, neck and back. My breathing feels like it s being restricted by something. I have been to see an ENT and Cardiologist which both did test and found nothing. I m scheduled to see a pulmonologist on 10 July but my breathing is really affecting just doing small things especially just breathing . I have to keep my mouth open in order to breath because if I close my mouth to breath thru my nose my air supply feels like it s being cut off. I m 48 years old and I ve never smoked and I m afraid I may have lung cancer. Can this e-cigarette be a cause of this respiratory problem that I m having? My name is Melanie and I hope you can give me some insight.