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In fact, some studies have found menthol smokers are less likely than non-menthol smokers to develop certain smoking-related diseases, like lung cancer, though this is likely due to the lower number of cigarettes menthol smokers tend to consume
The idea that they could be stems from the fact that e-cigarettes and other vaping devices can supply nicotine without tobacco or other additives and byproducts, like smoke, that are in a traditional cigarette
The Kyoto Encyclopedia of Genes and Genomes (KEGG) IDs (Kanehisa, 2000 #5) of differential metabolites were used for pathway analysis
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"Effects of electronic cigarette smoking on human health" (PDF)