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The studies remain inconclusive about how much marijuana use causes impairments of learning and memory

Griffing, an internal medicine professor at the Saint Louis University School of Medicine who was not involved in the study.

While lung cancer ranks first among the cancers caused by smoking, some other types of cancer caused by smoking include cancers of the mouth, larynx, esophagus, stomach, kidney and urinary tract, bowel, liver, pancreas, bladder, cervix, and a type of leukemia

7, 8 One study revealed that circulating dendritic cells (DCs) from infants exposed to environmental tobacco smoke produced less of the immunosuppressive cytokine IL-10 in vitro