what happened to the cigarette smoking man X-Files: Who Is The Man? Cigarette-Smoking Man | Villains Wiki

Flavor bans, or other measures intended to reduce the appeal of e-cigarettes, seemed to shift nicotine consumption back to cigarettes

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The lower limit of quantification of plasma nicotine using the analytical method was 0.2 ng/ml

In addition, criticisms about the translation of these results into clinical practice have been raised, for instance because of differences in the physiology and breathing behaviors between humans and rodents as well as the use of non-physiological exposure methods such as whole body exposure instead of mouth breathing [7, 18]