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(A–D Influence of smoking traditional cigarettes, e-cigarettes, and heat-not-burn products on the concentration of lipids in unstimulated and stimulated saliva. Cer – ceramides (C14: 0-Cer, C16: 0-Cer, C18: 1-Cer, C18: 0-Cer); NWS – non-stimulated whole; SWS – stimulated whole saliva; P<0.0001. The figure was created in GraphPad Prism.
