| http://www.w3.org/ns/prov#value | - Tar is a complex mixture that includes many chemicals that are cancer initiators and/or promoters.,58Tar and nicotine yields are measured with a smoking machine according to a standardized protocol established by the Federal Trade Commission (FTC) that specifies such details and puff volume, the frequency of puffing, and the length to which the cigarette is to be smoked.59
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