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It's the well-documented effect of all the chemicals in cigarette smoke on the lungs

Dimensions- W-4" x H-3.25"

Tobacco industry denormalisation as a tobacco control intervention: a review

Thrasher JF, Hammond D, Fong GT, et al

Any measures adopted with regards to package appearance would not remove the current labelling requirements, including the obligation to display pictorial or text-based health warnings

Additives that can speed up burn include: Nitrates Potassium compounds Flavored humectants Chemical stabilizers Native cigarettes, especially additive-free or minimally processed brands, may burn slightly faster or slower depending on the natural characteristics of the tobacco