However, studies have shown that smoking may delay regression of these lesions and increase the risk of persistent HPV infections on the cervix
Scientific testing has highlighted that e-cigarettes vary widely in the amount of nicotine and other chemicals they deliver , and this is not communicated to buyers
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[23] In 2021, researchers at Johns Hopkins University analyzed the vape aerosols of popular brands such as Juul and Vuse, and found "nearly 2,000 chemicals, the vast majority of which are unidentified." [24] E-cigarette vapor contains many of the known harmful toxicants found in traditional cigarette smoke, such as formaldehyde, cadmium, and lead, though usually at a reduced percentage