A new report says thousands of acres of parkland in London and landmarks including Trafalgar Square and Parliament Square should become smoke-free zones. The recommendations come in a report from cancer specialist Lord Darzi, who was appointed by mayor Boris Johnson to chair the London Health Commission. More than a million Londoners smoke and 67 of the city's schoolchildren take up the habit every day, the report said, concluding that the capital faces a public health emergency. .