the sticky thick liquid formed when tobacco burns is called Do you know what's in a cigarette? Cigarette smoke contains over 7,000 chemicals—69 are known to cause cancer Many of these chemicals also are found in consumer products, but these products have Tar | PPTX
Description
For that reason, cigar buyers often care about packaging, freshness, humidity control, and shipping handling more than cigarette buyers do

Conclusion Tobacco stains on teeth are a common and unpleasant consequence of smoking or using tobacco products
laced with dioxin
Metabolism and disposition kinetics of nicotine, Pharmacol Rev 57 (1): 79-115

Nicotine gradually alters brain chemistry, giving the impression that a person needs nicotine to feel normal