Did years of singing in smoky nightclubs kill Dana Reeve, the widow of paralysed Superman actor Christopher Reeve? She died yesterday of lung cancer even though she was not a smoker. "Ten to 15 per cent of people who develop lung cancer are thought to be non-smokers. It was said that she had, in the course of being an entertainer, spent a lot of time in pubs, in nightclubs, in which there is a lot of cigarette smoke," said Dr James Mulshine from Rush University Medical Centre in Chicago. Reeve, 44, won worldwide admiration for her devotion to her husband...