what is the dark sticky substance produced when tobacco burns

what is the dark sticky substance produced when tobacco burns Chemicals in Cigarettes and Tobacco: What's Burning? tobacco quiz.pptx

Name: what is the dark sticky substance produced when tobacco burns Chemicals in Cigarettes and Tobacco: What's Burning? tobacco quiz.pptx
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However, the smoke pH of smaller cigars became acidic after the first third of the cigar was consumed and remained acidic, while the larger cigars smoke pH, presumably including the premium cigars, became acidic during the first third and then alkaline during the last third (Henningfield et al., 1999)