 In a floor speech he quoted letters from doctors asking about the efficacy of the products that were marketed.He stressed that radiation had the effect of making many cancers worse, many doctors thought the belief that radium could be used to cure cancers at that stage of the development of therapy was a "delusion" — one doctor quoted cited a failure-to-success rate of 100 to 1 — and the effects of radium water were undemonstrated.Around the start of the 1920s, new public health concerns were sparked by the deaths of factory workers at a radioluminescent watch factory.