tobacco industry and marketing board – ASH > Action on Smoking & Health The Tobacco Industry Is Aggressively
Description
This is called an "observational study." It shows a pattern but doesn't prove cause and effect

Shi Y, Weingarten TN, Mantilla CB, Hooten WM, Warner DO

Cigarette smoke contains greasy tar residue and although the odor can be strong and pervasive there are many effective strategies to get rid of it

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