The colour change can come from oxygen reacting with ingredients in the e-liquid
Giedd, J
To that end, we end with a description of the contributions of this issue and directions and challenges for future research
Christman, a professor of medicine at Vanderbilt University and a spokesman for the American Lung Association, notes that ozone can be very hard on people with asthma or cardiovascular issues and may be harmful at high enough levels

The named products include 24,000 faulty carbon monoxide detectors that fail to alarm, numerous childrens sleepwear garments that are in violation of the flammable fabric safety standard risking burn injuries to children, and nearly 400,000 hair dryers sold without the required immersion protection devices that protect consumers against shock and electrocution. The CPSC said its complaint seeks to force Amazon, as a distributor of the products, to stop selling these products, work with CPSC staff on a recall of the products, and to directly notify consumers who purchased them about the recall and offer them a full refund. We must grapple with how to deal with these massive third-party platforms more efficiently, and how best to protect the American consumers who rely on them, CPSC acting Chairman Robert Adler said