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This can be either because their cancer depletes immune cells, or because treatments like chemotherapy suppress their immune system to slow tumor progression

Smoking causes serious health risks including cancer, heart disease, and other life-threatening conditions

Changes in biomarkers of exposure on switching from a conventional cigarette to tobacco heating products: a randomized, controlled study in healthy Japanese subjects

Persistent irritation could indicate an underlying issue that needs attention

Researchers believe that cigarette smoke contains more than 7,000 chemicals

The data was collected as part of the Coronary Artery Risk Development in Young Adults (CARDIA) study, which has been gathering data since 1985