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. 2021 Dec 22;29(18):27051–27069. doi: 10.1007/s11356-021-18032-x

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© The Author(s) 2021

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Fig. 6 — Elements observed in the tobacco material from a 3R4F cigarette (top) and from an IQOS tobacco stick (bottom). The observed elements are typical for living plant organisms. The platinum signal is attributed to the conductive coating of the samples