The Health Effects of Marijuana

Negative Health Effects Are Numerous

Research indicates that THC impairs the body’s immune system from fighting disease, which can cause a wide variety of health problems. One study found that marijuana actually inhibited the disease-preventing actions of key immune cells. Another study found that THC increased the risk of developing bacterial infections and tumors.

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http://alcoholism.about.com/od/pot/a/effects.-Lya.htm?nl=1