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Traditional cigarettes are tobacco wrapped in paper which burns when lit, releases nicotine and a host of toxic chemicals

DOI: 10.1371/journal.pone.0289058 Funding: NN is supported by the California Tobacco-Related Disease Research Program (grants T31FT1564 and T32KT5071) and the National Center for Advancing Translational Sciences, National Institutes of Health, through UCSF Clinical and Translational Science Institute (grant UL1 TR001872-06)

Scollo M, Younie S, Wakefield M, Freeman J, and Icasiano F

They're sort of for delivering nicotine directly into your lungs for a smoker who's used to that root of nicotine delivery