Hello vapers. I am a bit concerned about my vaping habits. I just got back from the doctor, and, after vaping ecigs and herb and hash oil, for about 2 months, my blood oxygen level was down to %90. I began vaping with the idea it was better for my lungs. Now I'm not so sure. While using combustion my oxygen level was always above %95.... Any ideas out there ? Similar stories ? Observations ? I'd like to hear it. Thanks.