Tobacco use can cause cancer of the bladder and kidneys.

• A. Cancer of the bladder and kidneys
• B. Cancer of the brain
• C. Cancer of the skin
• D. Cancer of the stomach

Answer: (A)

Tobacco exposes the body to cancer-causing chemicals that circulate in the bloodstream and are filtered by the kidneys, so the urinary tract is particularly at risk. These carcinogens are excreted into urine, meaning the lining of the bladder is in direct, prolonged contact with them, which can cause mutations and lead to bladder cancer. The kidneys, involved in filtering blood, are also exposed to these substances over time, increasing the chance of kidney cancer. This is why tobacco use is linked to cancers of both the bladder and the kidneys. Other cancers like those of the brain, skin, or stomach have different dominant risk factors and aren’t as directly associated with smoking as urinary tract cancers are.