Viagra
Drugs

''I can foresee, here and now, that people regularly using Viagra will be coming down with KS in two to three years because Viagra acts by blocking the neutralization of nitric oxide. When you take Viagra, nitric oxide accumulates, relaxing the smooth muscles, that blood is flowing in, the penis is being erected, and our muscles are relaxed. Poppers act by the same mode, because the nitrites are transformed into nitric oxide in the smallest vessels, and so the smallest vessels become relaxed. But whereas poppers directly produce nitric oxide, Viagra works by preventing the neutralization of nitric oxide which comes into existence normally in the process of blood pressure regulation. It constantly persists at a very low level, but if it accumulates, you are in a very big danger.
    So, if the blood has oxidized itself and the lining of the smallest vessels, the capillars (i.e. capillaries, F.C.] , is destroyed by nitric oxide, what's going to happen? Those cells will turn into cancer cells. There's a lack of oxygen, and the first cells to suffer this oxygen deficiency are the lining of the epithelium, the smallest vessels, where the nitrites are transformed into nitric oxide. And this is, as a matter of fact, the definition of Kaposi' Sarcoma: when the lining -- the interior of the smallest vessels -- develops into cancerous form, growing bigger and multiplying. This is hyperplasia, no a form of sarcoma, but a real form of cancer, and this is defined as KS. It can also come into existence even if you are not swallowing poppers, but when your cellular detoxification system is not working anymore.'' 
[1995] INTERVIEW STEFAN LANKA