"E-Cigarette Use Among Youth and Young Adults: A Report of the Surgeon General" (PDF)
It allows a more extended amount of contact with the tooth (often overnight), which allows the substance to bleach deep stains
Interestingly, many of the diseases that are likely caused by insulin resistance are continuously blamed on our meat consumption
They do contain small amounts of nicotine (same amount, or less, than a cigarette) for the buzz, but are powered by small lithium ion batteries the same kind of battery that powers all modern cell phones, cameras, tablets, laptops, and electric cars (yep)
Other causes include genetic disorders like cystic fibrosis, autoimmune conditions, and recurrent acute pancreatitis, which can lead to chronic changes over time