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Patterns of Tobacco/Nicotine Product Use (Combusted Tobacco Only, Combusted Tobacco and Non-Combusted Products, No Combusted Tobacco1–With or Without Non-Combusted Products). Footnote: Acronyms: VLNC, very low nicotine content (0.4 mg nicotine/gram tobacco); NNC, normal nicotine content (15.8 mg nicotine/gram tobacco); Ph1, Phase 1; Ph2, Phase 2. 1Verified by carbon monoxide ≤6 ppm.
