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What is known to damage the immune system?

Alcohol, smoking, bad nutrition, HIV, and AIDS.

Explanation:

All of these are known to damage the immune system.

HIV and AIDS are known to damage the white blood cells that are extremely important to your immune system.

Alcohol damages the function of your immune system.

Smoking introduces toxins into your system that harms your immune system.

Bad nutrition causes you to not have the correct nutrients to have a healthy immune system.

Hope this is correct, wishing you the best with your studies.

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