primary source tobacco in the colonies answer key Virginia Tobacco in the States -

It is well known that nicotine improves concentration, memory and attention, but tobacco smoking (the main form of nicotine delivery) causes heart disease, stroke and cancer

A 2023 study found that while Zyn products do not contain some cancer-causing agents found in cigarettes or vapes, they do contain chemicals the FDA finds harmful, including formaldehyde

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Yet these examples are just the tip of the iceberg

Progress in tobacco control in many high-income countries has substantially reduced mortality rates of lung (see Lung Cancer) and other smoking-related cancers