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John Reid wants everyone in the country to take part in the government's big debate on public health. He is looking for ideas on how to tackle "worrying trends" in obesity, ually transmitted infections and cancer. He wants to know just far people think the government should go to try to improve the nation's health. Should it ban smoking in public places? Should it restrict junk food advertising? Should it give free condoms to young people? Mr Reid says responses to the three-month consultation exercise will influence a new white paper on public health to be published later this year. However, critics say the exercise is a waste of time. They point to last week's report from Derek Wanless, the former chief executive of NatWest. He was asked by the Treasury to examine what the government should do to improve the nation's health. His conclusion was clear. "After many years of reviews and government policy doents with little change on the ground, the key challenge now is delivery and implementation, not further discussion," he said. Some believe ministers are simply in a muddle over public health. They point to comments by Culture Secretary Tessa Jowell on calls for junk food ads to be banned. Speaking on BBC Radio 4's Today programme just hours before John Reid launched his consultation exercise, she said she was sceptical about the merits of such a ban. "Whatever happened to joined up government," says Charlie Powell of Sustain, a pressure group which is leading the campaign for a ban. "I think she pre-empted the consultation," says Professor Sian Griffiths, president of the Faculty of Public Health. There is some concern that ministers may be simply putting off making the tough decisions. "The consultation will mean further delay in action to tackle very urgent public health problems in areas such as tobacco, alcohol, obesity," says Professor Carol Black of the Royal College of Physicians. "This college, like many other organisations, has produced detailed evidence-based recommendations on these issues which already provide answers to many of the questions posed in 'Choosing Health?"