I now believe you are right. Thanks for explaining carefully and kindly. :) Now I'm curious about which exhalations are the culprit. "The major VOCs in the b

I now believe you are right. Thanks for explaining carefully and kindly. :) Now I'm curious about which exhalations are the culprit. "The major VOCs in the breath of healthy individuals are isoprene (12–580 ppb), acetone (1.2–1,880 ppb), ethanol (13–1,000 ppb), methanol (160– 2,000 ppb), and other alcohols." https://doi.org/10.1080/10473289.1999.10463831 https://doi.org/10.1080/10473289.1999.10463831