es of actual human populations have failed to demonstrate that marijuana adversely affects the reproductive system. Claims that marijuana use may impair hormone production, menstrual cycles, or fertility in females are both unproven and unfounded. The Immune System Studies in which lab rats were injected with extremely large quantities of THC (the active compound in marijuana) have found that marijuana (in such unrealistically huge quantities) does have an "immunosuppressive effect" in those lab rats, in that it temporarily shuts off certain cells in the liver called lymphocytes and macrophages. These macrophages are useful in fighting off bacterial, not viral, infections. But this is only for the duration of intoxication. There also exists some evidence that marijuana metabolites remain in the lungs for up to seven months after smoking has ceased, possibly affecting the immune system of the lungs (but not by turning the cells off). This said, doctors and researchers are still not sure that the immune system is actually negatively affected in realistic situations since there are no numbers to support the idea. In fact, three studies showed that THC might have actually stimulated the immune system in the people studied. CancerSmoking marijuana has the potential to cause both bronchitis and cancer of the lungs, throat, and neck, but this is generally no different than inhaling any other burnt carbon-containing matter since they all increase the number of lesions (and therefore possible infections) in your airways. The Gateway Effect Marijuana use has not been found to act as a gateway drug to the use of harder drugs. Studies show that when the Dutch partially legalized marijuana in the 70's, heroin and cocaine use substantially declined, despite a slight increase in marijuana use. If the stepping stone theory were true, use should have gone up rather than down. In reality, it appears that marijuana use tends to substitute for the use of r...
