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"The scientists analyzed the metal and metalloids inside seven types of disposable devices from three of the most popular brands. Using an instrument to activate the disposable e-cigarettes and heat the internal liquid, they created between 500 and 1,500 puffs for each device. They found:
Some devices emitted surprisingly high concentrations of elements in the vapor, including antimony and lead. Levels of chromium, nickel and antimony increased as the number of puffs increased. Most of the disposable e-cigarettes tested released markedly higher amounts of metals and metalloids into vapors than earlier, refillable vapes."
https://www.ucdavis.edu/news/disposable-e-cigarettes-more-toxic-traditional-cigarettes
These are illegal Chinese imports which directly compete with Big Tobacco's established brands (Blu, NJOY, etc.) Only Juul out of these has American Tobacco industry ties with 35% owned by Altria aka Philip Morris. I wish they had tested Blu and NJOY.
Anyway, Big Tobacco would benefit if customs and ATF ramped up enforcement against these Chinese imports.