Some studies have hinted that eating broccoli  might help prevent lung cancer.  But a new study of non-smoking women finds no strong link between isothiocyanates – compounds found in cruciferous vegetables such as broccoli – and lower risk of lung cancer.  The study, of some 1,000 non-smoking Chinese women with and without lung cancer, showed no overall association between the women’s risk of the cancer and their urinary levels of isothiocyanates, which are thought to have anti-cancer properties.