For example, there are experts who believe that AIDS is the result of multiple factors, including drug use, stress and nutritional deficiency, but that government agencies made a politically strategic decision to de-emphasize these hypotheses and thus discourage certain researchers and their funding. Meanwhile, AZT, an infamously failed treatment for cancer, and now the primary FDA-approved approach to treating AIDS, is highly toxic and can produce the very symptoms of the illness it is prescribed to treat.