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2012 Dec 5;367(1607):3364-78

Over time, frequent e-cigarette use can also lead to tolerance, meaning you may need more nicotine to feel the same effect

For example, the WHO recommends increasing cigarette taxes by 9%, the country investing in high-level mass media campaigns, restricting tobacco advertising, implementing graphic health warnings on products, and strengthening the enforcement of regulations, which, within five years, could decrease smoking by as much as 23%

[18] Later-generation e-cigarettes often called mods, PVs (personal vaporizer) or APVs (advanced personal vaporizer) have an increased nicotine-dispersal performance, [18] house higher capacity batteries, and come in various shapes such as metal tubes and boxes

In a 2021 study, Canadian researchers tested 825 e-cigarettes and found just two products containing diacetyl and zero among the samples collected after 2018